chore: ignore .codegraph index and allow LAN access for vite dev server

- .gitignore 增加 .codegraph/（本地代码索引，不进版本库）
- vite dev server 开启 host，便于局域网访问本地前端

.gitignore

@@ -3,4 +3,5 @@ web/node_modules/
 web/test-results/
 .env
 .dev-credentials/
+.codegraph/
 tmp/

web/vite.config.js

@@ -5,6 +5,7 @@ import tailwindcss from "@tailwindcss/vite";
 export default defineConfig({
   plugins: [react(), tailwindcss()],
   server: {
+    host: true,
     port: 5173,
     strictPort: true,
     proxy: { "/api": "http://127.0.0.1:8082" },