fix: connect all new pages to router + navigation + backend API routes (Workstream, Wiki, Improvement, Onboarding, Dashboard, DSGVO), platform.py with 9 endpoints, tsc clean

app/main.py

@@ -73,6 +73,7 @@ from app.routes import (  # noqa: E402
     webhooks,
     workflows,
     workspaces,
+    platform,
 )
 
 # ── Graceful shutdown signal ─────────────────────────────────────────────────
@@ -580,6 +581,7 @@ def create_app() -> FastAPI:
     app.include_router(outbox.router)
     app.include_router(api_tokens.router)
     app.include_router(approvals.router)
+    app.include_router(platform.router)
 
     # ── Register plugin routes for all discovered plugins ──
     # Routes are registered at app creation time so OpenAPI docs are complete.