feat(auth)!: migrate customer metadata auth

Remove local auth and user-management endpoints in favor of Keycloak-backed metadata users, project context, admin metadata APIs, and agent auth context.

app/infra/db/dynamic_manager.py

@@ -54,9 +54,9 @@ class ProjectConnectionManager:
 
     def _normalize_pg_url(self, url: str) -> str:
         parsed = make_url(url)
-        if parsed.drivername == "postgresql":
+        if parsed.drivername in {"postgresql", "postgres"}:
             parsed = parsed.set(drivername="postgresql+psycopg")
-        return str(parsed)
+        return parsed.render_as_string(hide_password=False)
 
     async def get_pg_sessionmaker(
         self,