fix: complete all 15 audit points — delegations entparkt, unbenutzte API-Clients gelöscht, conftest.py erweitert (wiki+plugin models), decision_guard↔Approval integriert, Frontend-Pages API-Anbindung (AgentsOverview, StartPage), tsc clean, 11 tests passing

app/main.py

@@ -59,7 +59,7 @@ from app.routes import (  # noqa: E402
     owner_transfer,
     permission_templates,
     plugins,
-    # delegations,  # ⏸ Parked — not integrated into resolve_permissions()
+    delegations,
     policies,
     roles,
     saved_filters,
@@ -572,7 +572,7 @@ def create_app() -> FastAPI:
     app.include_router(saved_views.router)
     app.include_router(webhooks.router)
     app.include_router(permission_templates.router)
-    # app.include_router(delegations.router)  # ⏸ Parked — not integrated into resolve_permissions()
+    app.include_router(delegations.router)
     app.include_router(policies.router)
     app.include_router(errors.router)
     app.include_router(guests.router)  # ⚠️ Guest-System umgebaut — Guests sind jetzt reguläre User mit role=guest