feat: 实现大模型模型列表与供应商管理，并接入 Playwright 测试

补齐 LLM 子菜单路由，落地模型列表与供应商管理页面交互，同时引入功能与视觉回归用例以便后续页面持续验证。

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -10,6 +10,9 @@
     "lint:fix": "eslint . --fix",
     "format": "prettier --write .",
     "format:check": "prettier --check .",
+    "test:e2e": "playwright test",
+    "test:e2e:ui": "playwright test --ui",
+    "test:e2e:update": "playwright test --update-snapshots",
     "preview": "vite preview"
   },
   "dependencies": {
@@ -31,6 +34,7 @@
     "@commitlint/cli": "^21.2.1",
     "@commitlint/config-conventional": "^21.2.0",
     "@eslint/js": "^10.0.1",
+    "@playwright/test": "^1.61.1",
     "@types/node": "^24.13.2",
     "@types/react": "^19.2.17",
     "@types/react-dom": "^19.2.3",