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/UploadTab.tsx

@@ -0,0 +1,327 @@
+'use client'
+
+import { useState, useCallback } from 'react'
+import type { Collection, UploadResult } from '../types'
+
+const API_BASE = process.env.NEXT_PUBLIC_KLAUSUR_SERVICE_URL || 'http://localhost:8086'
+
+interface UploadTabProps {
+  collections: Collection[]
+  onUploadComplete: () => void
+}
+
+function UploadTab({
+  collections,
+  onUploadComplete
+}: UploadTabProps) {
+  const [isDragging, setIsDragging] = useState(false)
+  const [files, setFiles] = useState<File[]>([])
+  const [uploading, setUploading] = useState(false)
+  const [uploadResults, setUploadResults] = useState<UploadResult[]>([])
+  const [currentFile, setCurrentFile] = useState<string>('')
+  const [selectedCollection, setSelectedCollection] = useState('bp_nibis_eh')
+
+  const handleDrop = useCallback((e: React.DragEvent) => {
+    e.preventDefault()
+    setIsDragging(false)
+
+    const droppedFiles = Array.from(e.dataTransfer.files)
+    const validFiles = droppedFiles.filter(
+      f => f.name.endsWith('.zip') || f.name.endsWith('.pdf')
+    )
+    setFiles(prev => [...prev, ...validFiles])
+  }, [])
+
+  const handleFileSelect = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
+    if (e.target.files) {
+      const selectedFiles = Array.from(e.target.files)
+      setFiles(prev => [...prev, ...selectedFiles])
+    }
+  }, [])
+
+  const removeFile = useCallback((index: number) => {
+    setFiles(prev => prev.filter((_, i) => i !== index))
+  }, [])
+
+  const handleUpload = async () => {
+    if (files.length === 0) return
+
+    setUploading(true)
+    setUploadResults([])
+    const results: UploadResult[] = []
+
+    try {
+      for (const file of files) {
+        setCurrentFile(file.name)
+        const formData = new FormData()
+        formData.append('file', file)
+        formData.append('collection', selectedCollection)
+
+        try {
+          const res = await fetch(`${API_BASE}/api/v1/admin/rag/upload`, {
+            method: 'POST',
+            body: formData,
+          })
+
+          if (res.ok) {
+            const data = await res.json()
+            results.push({
+              filename: file.name,
+              status: data.status,
+              pdfs_extracted: data.pdfs_extracted,
+              pdfs_skipped: data.pdfs_skipped,
+              duplicates: data.duplicates || [],
+              target_year: data.target_year,
+              message: data.message,
+            })
+          } else {
+            results.push({
+              filename: file.name,
+              status: 'error',
+              pdfs_extracted: 0,
+              pdfs_skipped: 0,
+              duplicates: [],
+              target_year: 0,
+              message: 'Upload fehlgeschlagen',
+            })
+          }
+        } catch {
+          results.push({
+            filename: file.name,
+            status: 'error',
+            pdfs_extracted: 0,
+            pdfs_skipped: 0,
+            duplicates: [],
+            target_year: 0,
+            message: 'Netzwerkfehler',
+          })
+        }
+        setUploadResults([...results])
+      }
+
+      setFiles([])
+      setCurrentFile('')
+      onUploadComplete()
+    } catch (err) {
+      console.error('Upload failed:', err)
+    } finally {
+      setUploading(false)
+    }
+  }
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h2 className="text-lg font-semibold text-slate-900">Dokumente hochladen</h2>
+        <p className="text-sm text-slate-500">
+          ZIP-Archive oder einzelne PDFs hochladen. ZIPs werden automatisch entpackt.
+        </p>
+      </div>
+
+      {/* Collection Selector */}
+      <div>
+        <label className="block text-sm font-medium text-slate-700 mb-2">
+          Ziel-Sammlung
+        </label>
+        <select
+          value={selectedCollection}
+          onChange={(e) => setSelectedCollection(e.target.value)}
+          className="w-full md:w-96 px-3 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-500 focus:border-primary-500"
+        >
+          {collections.length > 0 ? (
+            collections.map((col) => (
+              <option key={col.name} value={col.name}>
+                {col.displayName} ({col.chunkCount.toLocaleString()} Chunks)
+              </option>
+            ))
+          ) : (
+            <option value="bp_nibis_eh">Niedersachsen - Klausurkorrektur</option>
+          )}
+        </select>
+        {collections.length === 0 && (
+          <p className="text-xs text-slate-500 mt-1">
+            Keine Sammlungen vorhanden. Erstellen Sie zuerst eine Sammlung im Tab "Sammlungen".
+          </p>
+        )}
+      </div>
+
+      {/* Drop Zone */}
+      <div
+        onDragOver={(e) => { e.preventDefault(); setIsDragging(true) }}
+        onDragLeave={() => setIsDragging(false)}
+        onDrop={handleDrop}
+        className={`
+          border-2 border-dashed rounded-lg p-12 text-center transition-colors
+          ${isDragging
+            ? 'border-primary-500 bg-primary-50'
+            : 'border-slate-300 hover:border-slate-400'
+          }
+        `}
+      >
+        <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="M7 16a4 4 0 01-.88-7.903A5 5 0 1115.9 6L16 6a5 5 0 011 9.9M15 13l-3-3m0 0l-3 3m3-3v12" />
+        </svg>
+        <p className="text-lg font-medium text-slate-700 mb-2">
+          ZIP-Datei oder Ordner hierher ziehen
+        </p>
+        <p className="text-sm text-slate-500 mb-4">
+          oder
+        </p>
+        <label className="cursor-pointer">
+          <span className="px-4 py-2 bg-white border border-slate-300 rounded-lg text-sm font-medium text-slate-700 hover:bg-slate-50">
+            Dateien auswählen
+          </span>
+          <input
+            type="file"
+            multiple
+            accept=".zip,.pdf"
+            onChange={handleFileSelect}
+            className="hidden"
+          />
+        </label>
+        <p className="text-xs text-slate-400 mt-4">
+          Unterstützt: .zip, .pdf
+        </p>
+      </div>
+
+      {/* File Queue */}
+      {files.length > 0 && (
+        <div className="space-y-3">
+          <h3 className="text-sm font-medium text-slate-700">Upload-Queue ({files.length})</h3>
+          {files.map((file, index) => (
+            <div
+              key={index}
+              className="flex items-center justify-between bg-slate-50 rounded-lg p-3"
+            >
+              <div className="flex items-center gap-3">
+                <svg className="w-5 h-5 text-slate-400" 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>
+                <div>
+                  <p className="text-sm font-medium text-slate-900">{file.name}</p>
+                  <p className="text-xs text-slate-500">
+                    {(file.size / 1024 / 1024).toFixed(2)} MB
+                  </p>
+                </div>
+              </div>
+              <button
+                onClick={() => removeFile(index)}
+                className="p-1 text-slate-400 hover:text-red-500"
+              >
+                <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>
+          ))}
+
+          <button
+            onClick={handleUpload}
+            disabled={uploading}
+            className="w-full py-3 bg-primary-600 text-white rounded-lg font-medium hover:bg-primary-700 disabled:opacity-50 disabled:cursor-not-allowed flex items-center justify-center gap-2"
+          >
+            {uploading ? (
+              <>
+                <div className="animate-spin rounded-full h-4 w-4 border-b-2 border-white"></div>
+                {currentFile ? `Lade ${currentFile}...` : 'Wird hochgeladen...'}
+              </>
+            ) : (
+              <>
+                <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-8l-4-4m0 0L8 8m4-4v12" />
+                </svg>
+                Hochladen
+              </>
+            )}
+          </button>
+        </div>
+      )}
+
+      {/* Upload Results */}
+      {uploadResults.length > 0 && (
+        <div className="space-y-3">
+          <h3 className="text-sm font-medium text-slate-700">Upload-Ergebnisse</h3>
+          {uploadResults.map((result, index) => (
+            <div
+              key={index}
+              className={`rounded-lg p-4 ${
+                result.status === 'success'
+                  ? 'bg-green-50 border border-green-200'
+                  : result.status === 'all_duplicates'
+                  ? 'bg-yellow-50 border border-yellow-200'
+                  : result.status === 'partial_duplicates'
+                  ? 'bg-blue-50 border border-blue-200'
+                  : 'bg-red-50 border border-red-200'
+              }`}
+            >
+              <div className="flex items-start justify-between">
+                <div className="flex items-center gap-2">
+                  {result.status === 'success' && (
+                    <svg className="w-5 h-5 text-green-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
+                    </svg>
+                  )}
+                  {result.status === 'all_duplicates' && (
+                    <svg className="w-5 h-5 text-yellow-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z" />
+                    </svg>
+                  )}
+                  {result.status === 'partial_duplicates' && (
+                    <svg className="w-5 h-5 text-blue-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
+                    </svg>
+                  )}
+                  {result.status === 'error' && (
+                    <svg className="w-5 h-5 text-red-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
+                    </svg>
+                  )}
+                  <span className="font-medium text-slate-900">{result.filename}</span>
+                </div>
+                <span className="text-sm text-slate-500">Jahr {result.target_year}</span>
+              </div>
+              <p className={`mt-1 text-sm ${
+                result.status === 'success' ? 'text-green-700' :
+                result.status === 'all_duplicates' ? 'text-yellow-700' :
+                result.status === 'partial_duplicates' ? 'text-blue-700' :
+                'text-red-700'
+              }`}>
+                {result.message}
+              </p>
+              {(result.pdfs_extracted ?? 0) > 0 && (
+                <p className="mt-1 text-xs text-slate-500">
+                  {result.pdfs_extracted} neue PDFs extrahiert
+                </p>
+              )}
+              {(result.pdfs_skipped ?? 0) > 0 && (result.duplicates?.length ?? 0) > 0 && (
+                <details className="mt-2">
+                  <summary className="text-xs text-slate-500 cursor-pointer hover:text-slate-700">
+                    {result.pdfs_skipped} Duplikate anzeigen
+                  </summary>
+                  <ul className="mt-1 text-xs text-slate-500 pl-4 max-h-32 overflow-y-auto">
+                    {result.duplicates?.map((dup, i) => (
+                      <li key={i} className="truncate">{dup}</li>
+                    ))}
+                  </ul>
+                </details>
+              )}
+            </div>
+          ))}
+          <button
+            onClick={() => setUploadResults([])}
+            className="text-sm text-slate-500 hover:text-slate-700"
+          >
+            Ergebnisse ausblenden
+          </button>
+        </div>
+      )}
+    </div>
+  )
+}
+
+// ============================================================================
+// Ingestion Tab
+// ============================================================================
+
+
+export { UploadTab }