feat: E2E 测试集成真实后端

- Playwright 双 webServer 模式自动启动 Go 后端 + Vite 前端
- 后端使用临时 SQLite 数据库隔离，固定端口 19026
- vite.config.ts proxy target 动态读取环境变量
- 新增 sql.js 依赖用于 SQLite 统计数据 seed
- 新增 e2e/fixtures.ts 共享工具模块（API seed + SQLite seed）
- 拆分测试文件 5→7（providers/models/stats/navigation/validation）
- 删除旧文件 crud.spec.ts/sidebar.spec.ts/stats-cards.spec.ts
- E2E 测试尚有部分用例需调试修复

frontend/bun.lock

@@ -24,6 +24,7 @@
         "@types/node": "^24.12.2",
         "@types/react": "^19.2.14",
         "@types/react-dom": "^19.2.3",
+        "@types/sql.js": "^1.4.11",
         "@vitejs/plugin-react": "^6.0.1",
         "@vitest/coverage-v8": "^3.2.1",
         "eslint": "^9.39.4",
@@ -35,6 +36,7 @@
         "jsdom": "^26.1.0",
         "msw": "^2.8.2",
         "sass": "^1.99.0",
+        "sql.js": "^1.14.1",
         "typescript": "~6.0.2",
         "typescript-eslint": "^8.58.0",
         "vite": "^8.0.4",
@@ -379,6 +381,8 @@
 
     "@types/deep-eql": ["@types/deep-eql@4.0.2", "https://registry.npmmirror.com/@types/deep-eql/-/deep-eql-4.0.2.tgz", {}, "sha512-c9h9dVVMigMPc4bwTvC5dxqtqJZwQPePsWjPlpSOnojbor6pGqdk541lfA7AqFQr5pB1BRdq0juY9db81BwyFw=="],
 
+    "@types/emscripten": ["@types/emscripten@1.41.5", "https://registry.npmmirror.com/@types/emscripten/-/emscripten-1.41.5.tgz", {}, "sha512-cMQm7pxu6BxtHyqJ7mQZ2kXWV5SLmugybFdHCBbJ5eHzOo6VhBckEgAT3//rP5FwPHNPeEiq4SmQ5ucBwsOo4Q=="],
+
     "@types/estree": ["@types/estree@1.0.8", "https://registry.npmmirror.com/@types/estree/-/estree-1.0.8.tgz", {}, "sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w=="],
 
     "@types/json-schema": ["@types/json-schema@7.0.15", "https://registry.npmmirror.com/@types/json-schema/-/json-schema-7.0.15.tgz", {}, "sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA=="],
@@ -393,6 +397,8 @@
 
     "@types/sortablejs": ["@types/sortablejs@1.15.9", "https://registry.npmmirror.com/@types/sortablejs/-/sortablejs-1.15.9.tgz", {}, "sha512-7HP+rZGE2p886PKV9c9OJzLBI6BBJu1O7lJGYnPyG3fS4/duUCcngkNCjsLwIMV+WMqANe3tt4irrXHSIe68OQ=="],
 
+    "@types/sql.js": ["@types/sql.js@1.4.11", "https://registry.npmmirror.com/@types/sql.js/-/sql.js-1.4.11.tgz", { "dependencies": { "@types/emscripten": "*", "@types/node": "*" } }, "sha512-QXIx38p2ZThJaK9vP5ZdqdlRe1FG9I8SmCZOS7FHfB/2qPAjZwkL7/vlfPg6N/oWHuuOaGg/P/IRwfP2W0kWVQ=="],
+
     "@types/statuses": ["@types/statuses@2.0.6", "https://registry.npmmirror.com/@types/statuses/-/statuses-2.0.6.tgz", {}, "sha512-xMAgYwceFhRA2zY+XbEA7mxYbA093wdiW8Vu6gZPGWy9cmOyU9XesH1tNcEWsKFd5Vzrqx5T3D38PWx1FIIXkA=="],
 
     "@types/use-sync-external-store": ["@types/use-sync-external-store@0.0.6", "https://registry.npmmirror.com/@types/use-sync-external-store/-/use-sync-external-store-0.0.6.tgz", {}, "sha512-zFDAD+tlpf2r4asuHEj0XH6pY6i0g5NeAHPn+15wk3BV6JA69eERFXC1gyGThDkVa1zCyKr5jox1+2LbV/AMLg=="],
@@ -1077,6 +1083,8 @@
 
     "source-map-js": ["source-map-js@1.2.1", "https://registry.npmmirror.com/source-map-js/-/source-map-js-1.2.1.tgz", {}, "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA=="],
 
+    "sql.js": ["sql.js@1.14.1", "https://registry.npmmirror.com/sql.js/-/sql.js-1.14.1.tgz", {}, "sha512-gcj8zBWU5cFsi9WUP+4bFNXAyF1iRpA3LLyS/DP5xlrNzGmPIizUeBggKa8DbDwdqaKwUcTEnChtd2grWo/x/A=="],
+
     "stackback": ["stackback@0.0.2", "https://registry.npmmirror.com/stackback/-/stackback-0.0.2.tgz", {}, "sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw=="],
 
     "statuses": ["statuses@2.0.2", "https://registry.npmmirror.com/statuses/-/statuses-2.0.2.tgz", {}, "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw=="],