feat: scaffold ant design mobile frontend

- Vite + React 18 + TypeScript + React Router v6 + Ant Design Mobile
- /v1 proxy to http://127.0.0.1:3201 in vite.config.ts
- Placeholder routes for / and /login
- Build verified passing

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

h5-app/tsconfig.json

@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["src"]
+}