feat: strengthen module contracts and shared WebUI runtime

tests/test_conditional_requests.py

@@ -6,6 +6,7 @@ from fastapi import APIRouter, Response
 from fastapi.responses import PlainTextResponse
 from fastapi.testclient import TestClient
 
+from govoplan_core.auth import get_api_principal
 from govoplan_core.core.registry import PlatformRegistry
 from govoplan_core.server.fastapi import create_govoplan_app
 from govoplan_core.server.platform import create_platform_router
@@ -85,6 +86,7 @@ class ConditionalRequestTests(unittest.TestCase):
             registry=PlatformRegistry(),
             api_router=api_router,
         )
+        app.dependency_overrides[get_api_principal] = lambda: object()
 
         with TestClient(app) as client:
             for path in (