fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

website/app/admin/rag/components/DocumentsTab.tsx

@@ -0,0 +1,425 @@
+'use client'
+
+import { useState, useEffect, useCallback } from 'react'
+import type { 
+  Collection, 
+  IndexedDocument, 
+  IndexedDocumentsData, 
+  DocumentContent 
+} from '../types'
+
+const API_BASE = process.env.NEXT_PUBLIC_KLAUSUR_SERVICE_URL || 'http://localhost:8086'
+
+interface DocumentsTabProps {
+  collections: Collection[]
+}
+
+function DocumentsTab({ collections }: DocumentsTabProps) {
+  const [documents, setDocuments] = useState<IndexedDocumentsData | null>(null)
+  const [loading, setLoading] = useState(true)
+  const [selectedCollection, setSelectedCollection] = useState('bp_nibis_eh')
+  const [yearFilter, setYearFilter] = useState<string>('')
+  const [subjectFilter, setSubjectFilter] = useState<string>('')
+  const [currentPage, setCurrentPage] = useState(0)
+  const [deleting, setDeleting] = useState<string | null>(null)
+  const [deleteConfirm, setDeleteConfirm] = useState<string | null>(null)
+  const [viewingDoc, setViewingDoc] = useState<DocumentContent | null>(null)
+  const [loadingContent, setLoadingContent] = useState(false)
+
+  const pageSize = 20
+
+  const fetchDocuments = useCallback(async () => {
+    setLoading(true)
+    try {
+      const params = new URLSearchParams({
+        collection: selectedCollection,
+        limit: pageSize.toString(),
+        offset: (currentPage * pageSize).toString(),
+      })
+      if (yearFilter) params.append('year', yearFilter)
+      if (subjectFilter) params.append('subject', subjectFilter)
+
+      const res = await fetch(`${API_BASE}/api/v1/admin/rag/files/indexed?${params}`)
+      if (res.ok) {
+        const data = await res.json()
+        setDocuments(data)
+      }
+    } catch (err) {
+      console.error('Failed to fetch documents:', err)
+    } finally {
+      setLoading(false)
+    }
+  }, [selectedCollection, yearFilter, subjectFilter, currentPage])
+
+  useEffect(() => {
+    fetchDocuments()
+  }, [fetchDocuments])
+
+  const handleDelete = async (docId: string, deleteSource: boolean = false) => {
+    setDeleting(docId)
+    try {
+      const params = new URLSearchParams()
+      if (deleteSource) params.append('delete_source', 'true')
+
+      const res = await fetch(
+        `${API_BASE}/api/v1/admin/rag/files/${selectedCollection}/${encodeURIComponent(docId)}?${params}`,
+        { method: 'DELETE' }
+      )
+
+      if (res.ok) {
+        // Refresh the list
+        await fetchDocuments()
+        setDeleteConfirm(null)
+      }
+    } catch (err) {
+      console.error('Failed to delete document:', err)
+    } finally {
+      setDeleting(null)
+    }
+  }
+
+  const handleViewDocument = async (docId: string) => {
+    setLoadingContent(true)
+    try {
+      const res = await fetch(
+        `${API_BASE}/api/v1/admin/rag/files/${selectedCollection}/${encodeURIComponent(docId)}/content`
+      )
+      if (res.ok) {
+        const data = await res.json()
+        setViewingDoc(data)
+      }
+    } catch (err) {
+      console.error('Failed to load document content:', err)
+    } finally {
+      setLoadingContent(false)
+    }
+  }
+
+  const handleDownloadPdf = (docId: string) => {
+    window.open(
+      `${API_BASE}/api/v1/admin/rag/files/${selectedCollection}/${encodeURIComponent(docId)}/download`,
+      '_blank'
+    )
+  }
+
+  return (
+    <div className="space-y-6">
+      <div className="flex items-center justify-between">
+        <div>
+          <h2 className="text-lg font-semibold text-slate-900">Indexierte Dokumente</h2>
+          <p className="text-sm text-slate-500">
+            Übersicht aller indexierten Dokumente mit Möglichkeit zum Löschen
+          </p>
+        </div>
+        <button
+          onClick={fetchDocuments}
+          className="px-4 py-2 text-sm font-medium text-slate-700 bg-white border border-slate-300 rounded-lg hover:bg-slate-50"
+        >
+          Aktualisieren
+        </button>
+      </div>
+
+      {/* Filters */}
+      <div className="bg-white rounded-lg border border-slate-200 p-4">
+        <div className="flex flex-wrap gap-4">
+          <div className="w-64">
+            <label className="block text-sm font-medium text-slate-700 mb-1">Sammlung</label>
+            <select
+              value={selectedCollection}
+              onChange={(e) => {
+                setSelectedCollection(e.target.value)
+                setCurrentPage(0)
+              }}
+              className="w-full px-3 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-500"
+            >
+              {collections.length > 0 ? (
+                collections.map((col) => (
+                  <option key={col.name} value={col.name}>
+                    {col.displayName}
+                  </option>
+                ))
+              ) : (
+                <option value="bp_nibis_eh">Niedersachsen - Klausurkorrektur</option>
+              )}
+            </select>
+          </div>
+
+          {documents && (
+            <>
+              <div className="w-32">
+                <label className="block text-sm font-medium text-slate-700 mb-1">Jahr</label>
+                <select
+                  value={yearFilter}
+                  onChange={(e) => {
+                    setYearFilter(e.target.value)
+                    setCurrentPage(0)
+                  }}
+                  className="w-full px-3 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-500"
+                >
+                  <option value="">Alle Jahre</option>
+                  {documents.years?.map((y) => (
+                    <option key={y} value={y}>{y}</option>
+                  ))}
+                </select>
+              </div>
+
+              <div className="w-48">
+                <label className="block text-sm font-medium text-slate-700 mb-1">Fach</label>
+                <select
+                  value={subjectFilter}
+                  onChange={(e) => {
+                    setSubjectFilter(e.target.value)
+                    setCurrentPage(0)
+                  }}
+                  className="w-full px-3 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-500"
+                >
+                  <option value="">Alle Fächer</option>
+                  {documents.subjects?.map((s) => (
+                    <option key={s} value={s}>{s}</option>
+                  ))}
+                </select>
+              </div>
+            </>
+          )}
+        </div>
+
+        {documents && (
+          <div className="mt-4 flex items-center gap-6 text-sm text-slate-600">
+            <span>
+              <strong>{documents.total_documents ?? documents.totalCount}</strong> Dokumente
+            </span>
+            <span>
+              <strong>{(documents.total_chunks ?? 0).toLocaleString()}</strong> Chunks
+            </span>
+          </div>
+        )}
+      </div>
+
+      {/* Documents List */}
+      {loading ? (
+        <div className="flex items-center justify-center py-12">
+          <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary-600"></div>
+        </div>
+      ) : documents && documents.documents.length > 0 ? (
+        <div className="bg-white rounded-lg border border-slate-200 overflow-hidden">
+          <table className="w-full">
+            <thead className="bg-slate-50 border-b border-slate-200">
+              <tr>
+                <th className="px-4 py-3 text-left text-xs font-medium text-slate-500 uppercase tracking-wider">
+                  Jahr
+                </th>
+                <th className="px-4 py-3 text-left text-xs font-medium text-slate-500 uppercase tracking-wider">
+                  Fach
+                </th>
+                <th className="px-4 py-3 text-left text-xs font-medium text-slate-500 uppercase tracking-wider">
+                  Niveau
+                </th>
+                <th className="px-4 py-3 text-left text-xs font-medium text-slate-500 uppercase tracking-wider">
+                  Typ
+                </th>
+                <th className="px-4 py-3 text-left text-xs font-medium text-slate-500 uppercase tracking-wider">
+                  Chunks
+                </th>
+                <th className="px-4 py-3 text-left text-xs font-medium text-slate-500 uppercase tracking-wider">
+                  Vorschau
+                </th>
+                <th className="px-4 py-3 text-right text-xs font-medium text-slate-500 uppercase tracking-wider">
+                  Aktionen
+                </th>
+              </tr>
+            </thead>
+            <tbody className="divide-y divide-slate-200">
+              {documents.documents.map((doc) => (
+                <tr key={doc.doc_id} className="hover:bg-slate-50">
+                  <td className="px-4 py-3 text-sm font-medium text-slate-900">
+                    {doc.year || '-'}
+                  </td>
+                  <td className="px-4 py-3 text-sm text-slate-700">
+                    {doc.subject || '-'}
+                  </td>
+                  <td className="px-4 py-3 text-sm text-slate-600">
+                    {doc.niveau || '-'}
+                  </td>
+                  <td className="px-4 py-3">
+                    <span className="px-2 py-1 bg-slate-100 text-slate-700 text-xs rounded">
+                      {doc.doc_type || '-'}
+                    </span>
+                  </td>
+                  <td className="px-4 py-3 text-sm text-slate-600 font-mono">
+                    {doc.chunk_count}
+                  </td>
+                  <td className="px-4 py-3 text-xs text-slate-500 max-w-xs truncate">
+                    {doc.sample_text || '-'}
+                  </td>
+                  <td className="px-4 py-3 text-right">
+                    {deleteConfirm === doc.doc_id ? (
+                      <div className="flex items-center justify-end gap-2">
+                        <button
+                          onClick={() => handleDelete(doc.doc_id, false)}
+                          disabled={deleting === doc.doc_id}
+                          className="px-2 py-1 text-xs text-red-700 bg-red-100 rounded hover:bg-red-200"
+                        >
+                          Nur Index
+                        </button>
+                        <button
+                          onClick={() => handleDelete(doc.doc_id, true)}
+                          disabled={deleting === doc.doc_id}
+                          className="px-2 py-1 text-xs text-red-900 bg-red-200 rounded hover:bg-red-300"
+                        >
+                          + Datei
+                        </button>
+                        <button
+                          onClick={() => setDeleteConfirm(null)}
+                          className="px-2 py-1 text-xs text-slate-600 bg-slate-100 rounded hover:bg-slate-200"
+                        >
+                          Abbrechen
+                        </button>
+                      </div>
+                    ) : (
+                      <div className="flex items-center justify-end gap-1">
+                        <button
+                          onClick={() => handleViewDocument(doc.doc_id)}
+                          className="p-1 text-slate-400 hover:text-primary-600"
+                          title="Dokument anzeigen"
+                        >
+                          <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
+                            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M2.458 12C3.732 7.943 7.523 5 12 5c4.478 0 8.268 2.943 9.542 7-1.274 4.057-5.064 7-9.542 7-4.477 0-8.268-2.943-9.542-7z" />
+                          </svg>
+                        </button>
+                        <button
+                          onClick={() => handleDownloadPdf(doc.doc_id)}
+                          className="p-1 text-slate-400 hover:text-blue-600"
+                          title="PDF herunterladen"
+                        >
+                          <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 10v6m0 0l-3-3m3 3l3-3m2 8H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
+                          </svg>
+                        </button>
+                        <button
+                          onClick={() => setDeleteConfirm(doc.doc_id)}
+                          className="p-1 text-slate-400 hover:text-red-600"
+                          title="Dokument löschen"
+                        >
+                          <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16" />
+                          </svg>
+                        </button>
+                      </div>
+                    )}
+                  </td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+
+          {/* Pagination */}
+          {documents.pagination && (
+            <div className="px-4 py-3 border-t border-slate-200 flex items-center justify-between bg-slate-50">
+              <span className="text-sm text-slate-600">
+                Zeige {documents.pagination.offset + 1} bis{' '}
+                {Math.min(documents.pagination.offset + pageSize, documents.total_documents ?? documents.totalCount)} von{' '}
+                {documents.total_documents ?? documents.totalCount}
+              </span>
+              <div className="flex gap-2">
+                <button
+                  onClick={() => setCurrentPage((p) => Math.max(0, p - 1))}
+                  disabled={currentPage === 0}
+                  className="px-3 py-1 text-sm font-medium text-slate-700 bg-white border border-slate-300 rounded hover:bg-slate-50 disabled:opacity-50 disabled:cursor-not-allowed"
+                >
+                  Zurück
+                </button>
+                <button
+                  onClick={() => setCurrentPage((p) => p + 1)}
+                  disabled={!documents.pagination.has_more}
+                  className="px-3 py-1 text-sm font-medium text-slate-700 bg-white border border-slate-300 rounded hover:bg-slate-50 disabled:opacity-50 disabled:cursor-not-allowed"
+                >
+                  Weiter
+                </button>
+              </div>
+            </div>
+          )}
+        </div>
+      ) : (
+        <div className="bg-slate-50 rounded-lg p-8 text-center">
+          <svg className="w-12 h-12 text-slate-400 mx-auto mb-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
+          </svg>
+          <h3 className="text-lg font-medium text-slate-900 mb-2">Keine Dokumente gefunden</h3>
+          <p className="text-slate-500">
+            {yearFilter || subjectFilter
+              ? 'Keine Dokumente mit den gewählten Filtern.'
+              : 'Diese Sammlung enthält noch keine indexierten Dokumente.'}
+          </p>
+        </div>
+      )}
+
+      {/* Document Viewer Modal */}
+      {(viewingDoc || loadingContent) && (
+        <div className="fixed inset-0 bg-black/50 flex items-center justify-center z-50 p-4">
+          <div className="bg-white rounded-xl shadow-xl w-full max-w-4xl max-h-[90vh] flex flex-col">
+            {/* Header */}
+            <div className="p-4 border-b border-slate-200 flex items-center justify-between">
+              <div>
+                <h3 className="text-lg font-semibold text-slate-900">
+                  {viewingDoc?.metadata?.filename || 'Dokument'}
+                </h3>
+                {viewingDoc?.metadata && (
+                  <div className="flex items-center gap-3 mt-1 text-sm text-slate-500">
+                    {viewingDoc.metadata.year && <span>{viewingDoc.metadata.year}</span>}
+                    {viewingDoc.metadata.subject && <span>{viewingDoc.metadata.subject}</span>}
+                    {viewingDoc.metadata.niveau && <span>{viewingDoc.metadata.niveau}</span>}
+                    <span>{viewingDoc?.chunk_count} Chunks</span>
+                  </div>
+                )}
+              </div>
+              <div className="flex items-center gap-2">
+                {viewingDoc && (
+                  <button
+                    onClick={() => handleDownloadPdf(viewingDoc.doc_id)}
+                    className="px-3 py-1.5 text-sm font-medium text-blue-700 bg-blue-50 rounded-lg hover:bg-blue-100 flex items-center gap-1"
+                  >
+                    <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 10v6m0 0l-3-3m3 3l3-3m2 8H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
+                    </svg>
+                    PDF
+                  </button>
+                )}
+                <button
+                  onClick={() => setViewingDoc(null)}
+                  className="p-1.5 text-slate-400 hover:text-slate-600 rounded-lg hover:bg-slate-100"
+                >
+                  <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
+                  </svg>
+                </button>
+              </div>
+            </div>
+
+            {/* Content */}
+            <div className="flex-1 overflow-y-auto p-6">
+              {loadingContent ? (
+                <div className="flex items-center justify-center py-12">
+                  <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary-600"></div>
+                </div>
+              ) : viewingDoc ? (
+                <div className="prose prose-slate max-w-none">
+                  <pre className="whitespace-pre-wrap font-sans text-sm text-slate-700 bg-slate-50 p-4 rounded-lg">
+                    {viewingDoc.text}
+                  </pre>
+                </div>
+              ) : null}
+            </div>
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}
+
+// ============================================================================
+// Search Tab
+// ============================================================================
+
+
+export { DocumentsTab }