feat: Legal Templates Service — eigene Vorlagen für Dokumentengenerator

Implementiert MIT-lizenzierte DSGVO-Templates (DSE, Impressum, AGB) in
der eigenen PostgreSQL-Datenbank statt KLAUSUR_SERVICE-Abhängigkeit.

- Migration 018: compliance_legal_templates Tabelle + 3 Seed-Templates
- Routes: GET/POST/PUT/DELETE /legal-templates + /status + /sources
- Registriert im bestehenden compliance catch-all Proxy (kein neuer Proxy)
- searchTemplates.ts: eigenes Backend als Primary, RAG bleibt Fallback
- ServiceMode-Banner: KLAUSUR_SERVICE-Referenz entfernt
- Tests: 25 Python + 3 Vitest — alle grün

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

backend-compliance/compliance/api/__init__.py

@@ -19,6 +19,7 @@ from .obligation_routes import router as obligation_router
 from .security_backlog_routes import router as security_backlog_router
 from .quality_routes import router as quality_router
 from .loeschfristen_routes import router as loeschfristen_router
+from .legal_template_routes import router as legal_template_router
 
 # Include sub-routers
 router.include_router(audit_router)
@@ -39,6 +40,7 @@ router.include_router(obligation_router)
 router.include_router(security_backlog_router)
 router.include_router(quality_router)
 router.include_router(loeschfristen_router)
+router.include_router(legal_template_router)
 
 __all__ = [
     "router",
@@ -60,4 +62,5 @@ __all__ = [
     "security_backlog_router",
     "quality_router",
     "loeschfristen_router",
+    "legal_template_router",
 ]