feat(dsr): Go DSR deprecated, Python Export-Endpoint, Frontend an Backend-APIs anbinden

- Go: DEPRECATED-Kommentare an allen DSR-Handlern und Routes
- Python: GET /dsr/export?format=csv|json (Semikolon-CSV, 12 Spalten)
- API-Client: 12 neue Funktionen (verify, assign, extend, complete, reject, communications, exception-checks, history)
- Detail-Seite: Alle Actions verdrahtet (keine Coming-soon-Alerts mehr), Communications + Art.17(3)-Checks + Audit-Log live
- Haupt-Seite: CSV-Export-Button im Header
- Tests: 54/54 bestanden (4 neue Export-Tests)

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

backend-compliance/compliance/api/dsr_routes.py

@@ -4,11 +4,14 @@ DSR (Data Subject Request) Routes — Betroffenenanfragen nach DSGVO Art. 15-21.
 Native Python/FastAPI Implementierung, ersetzt Go consent-service Proxy.
 """
 
+import io
+import csv
 import uuid
 from datetime import datetime, timedelta
 from typing import Optional, List, Dict, Any
 
 from fastapi import APIRouter, Depends, HTTPException, Query, Header
+from fastapi.responses import StreamingResponse
 from pydantic import BaseModel
 from sqlalchemy.orm import Session
 from sqlalchemy import text, func, and_, or_, cast, String
@@ -438,6 +441,61 @@ async def get_dsr_stats(
     }
 
 
+# =============================================================================
+# Export
+# =============================================================================
+
+@router.get("/export")
+async def export_dsrs(
+    format: str = Query("csv", pattern="^(csv|json)$"),
+    tenant_id: str = Depends(_get_tenant),
+    db: Session = Depends(get_db),
+):
+    """Exportiert alle DSRs als CSV oder JSON."""
+    tid = uuid.UUID(tenant_id)
+    dsrs = db.query(DSRRequestDB).filter(
+        DSRRequestDB.tenant_id == tid,
+    ).order_by(DSRRequestDB.created_at.desc()).all()
+
+    if format == "json":
+        return {
+            "exported_at": datetime.utcnow().isoformat(),
+            "total": len(dsrs),
+            "requests": [_dsr_to_dict(d) for d in dsrs],
+        }
+
+    # CSV export (semicolon-separated, matching Go format + extended fields)
+    output = io.StringIO()
+    writer = csv.writer(output, delimiter=';', quoting=csv.QUOTE_MINIMAL)
+    writer.writerow([
+        "ID", "Referenznummer", "Typ", "Name", "E-Mail", "Status",
+        "Prioritaet", "Eingegangen", "Frist", "Abgeschlossen", "Quelle", "Zugewiesen",
+    ])
+
+    for dsr in dsrs:
+        writer.writerow([
+            str(dsr.id),
+            dsr.request_number or "",
+            dsr.request_type or "",
+            dsr.requester_name or "",
+            dsr.requester_email or "",
+            dsr.status or "",
+            dsr.priority or "",
+            dsr.received_at.strftime("%Y-%m-%d") if dsr.received_at else "",
+            dsr.deadline_at.strftime("%Y-%m-%d") if dsr.deadline_at else "",
+            dsr.completed_at.strftime("%Y-%m-%d") if dsr.completed_at else "",
+            dsr.source or "",
+            dsr.assigned_to or "",
+        ])
+
+    output.seek(0)
+    return StreamingResponse(
+        output,
+        media_type="text/csv; charset=utf-8",
+        headers={"Content-Disposition": "attachment; filename=dsr_export.csv"},
+    )
+
+
 # =============================================================================
 # Deadline Processing (MUST be before /{dsr_id} to avoid path conflicts)
 # =============================================================================