feat: Projekt-Verwaltung verbessern — Archivieren, Loeschen, Wiederherstellen

- Backend: Restore-Endpoint (POST /projects/{id}/restore) und
  Hard-Delete-Endpoint (DELETE /projects/{id}/permanent) hinzugefuegt
- Frontend: Dreistufiger Dialog (Archivieren / Endgueltig loeschen mit
  Bestaetigungsdialog) statt einfachem Loeschen
- Archivierte Projekte aufklappbar in der Projektliste mit
  Wiederherstellen-Button
- CustomerTypeSelector entfernt (redundant seit Multi-Projekt)
- Default tenantId von 'default' auf UUID geaendert (Backend-400-Fix)
- SQL-Cast :state::jsonb durch CAST(:state AS jsonb) ersetzt (SQLAlchemy-Fix)
- snake_case/camelCase-Mapping fuer Backend-Response (NaN-Datum-Fix)
- projectInfo wird beim Laden vom Backend geholt (Header zeigt Projektname)
- API-Client erzeugt sich on-demand (Race-Condition-Fix fuer Projektliste)

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

admin-compliance/app/api/sdk/v1/projects/[projectId]/permanent/route.ts

@@ -0,0 +1,41 @@
+import { NextRequest, NextResponse } from 'next/server'
+
+const BACKEND_URL = process.env.BACKEND_URL || 'http://backend-compliance:8002'
+
+/**
+ * Proxy: DELETE /api/sdk/v1/projects/{projectId}/permanent → Backend (hard delete)
+ */
+export async function DELETE(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  try {
+    const { projectId } = await params
+    const tenantId = request.headers.get('X-Tenant-ID') ||
+      new URL(request.url).searchParams.get('tenant_id') || ''
+
+    const response = await fetch(
+      `${BACKEND_URL}/api/compliance/v1/projects/${projectId}/permanent?tenant_id=${encodeURIComponent(tenantId)}`,
+      {
+        method: 'DELETE',
+        headers: { 'X-Tenant-ID': tenantId },
+      }
+    )
+
+    if (!response.ok) {
+      const errorText = await response.text()
+      return NextResponse.json(
+        { error: 'Backend error', details: errorText },
+        { status: response.status }
+      )
+    }
+
+    return NextResponse.json(await response.json())
+  } catch (error) {
+    console.error('Failed to permanently delete project:', error)
+    return NextResponse.json(
+      { error: 'Failed to connect to backend' },
+      { status: 503 }
+    )
+  }
+}

admin-compliance/app/api/sdk/v1/projects/[projectId]/restore/route.ts

@@ -0,0 +1,41 @@
+import { NextRequest, NextResponse } from 'next/server'
+
+const BACKEND_URL = process.env.BACKEND_URL || 'http://backend-compliance:8002'
+
+/**
+ * Proxy: POST /api/sdk/v1/projects/{projectId}/restore → Backend
+ */
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  try {
+    const { projectId } = await params
+    const tenantId = request.headers.get('X-Tenant-ID') ||
+      new URL(request.url).searchParams.get('tenant_id') || ''
+
+    const response = await fetch(
+      `${BACKEND_URL}/api/compliance/v1/projects/${projectId}/restore?tenant_id=${encodeURIComponent(tenantId)}`,
+      {
+        method: 'POST',
+        headers: { 'X-Tenant-ID': tenantId },
+      }
+    )
+
+    if (!response.ok) {
+      const errorText = await response.text()
+      return NextResponse.json(
+        { error: 'Backend error', details: errorText },
+        { status: response.status }
+      )
+    }
+
+    return NextResponse.json(await response.json())
+  } catch (error) {
+    console.error('Failed to restore project:', error)
+    return NextResponse.json(
+      { error: 'Failed to connect to backend' },
+      { status: 503 }
+    )
+  }
+}