feat: initialize zhixing-web with React, React Router, and Tailwind CSS

- Set up the main application structure with App component and routing.
- Implemented global state management for UI theme using Zustand.
- Created API utilities for fetching system status.
- Developed system status page with responsive design and theme toggle.
- Added testing setup with Vitest and initial tests for system status page.
- Configured TypeScript with appropriate settings for the application.
- Integrated Tailwind CSS for styling and responsive design.
- Established Vite configuration for development and testing environments.

zhixing-server/tests/test_system_http.py

@@ -0,0 +1,25 @@
+"""HTTP contract tests for operational system routes."""
+
+from fastapi.testclient import TestClient
+
+from zhixing_server.bootstrap.app import create_app
+
+
+def test_health_endpoint_reports_ok() -> None:
+    """The container probe receives the stable operational contract."""
+    response = TestClient(create_app()).get("/healthz")
+
+    assert response.status_code == 200
+    assert response.json() == {"status": "ok"}
+
+
+def test_system_status_exposes_safe_runtime_metadata() -> None:
+    """The frontend smoke endpoint omits secrets and reports connectivity metadata."""
+    response = TestClient(create_app()).get("/api/v1/system/status")
+
+    assert response.status_code == 200
+    assert response.json() == {
+        "environment": "development",
+        "service": "Zhixing Server",
+        "status": "ok",
+    }