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>

playwright.config.ts

@@ -0,0 +1,33 @@
+import { defineConfig, devices } from '@playwright/test';
+import process from 'node:process';
+
+export default defineConfig({
+  testDir: './e2e',
+  fullyParallel: true,
+  forbidOnly: Boolean(process.env.CI),
+  retries: process.env.CI ? 2 : 0,
+  reporter: process.env.CI ? [['html', { open: 'never' }], ['github']] : 'list',
+  use: {
+    baseURL: 'http://127.0.0.1:8083',
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+  },
+  webServer: {
+    command: 'pnpm dev --host 127.0.0.1',
+    url: 'http://127.0.0.1:8083',
+    reuseExistingServer: !process.env.CI,
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'], channel: 'chrome' },
+    },
+  ],
+  snapshotPathTemplate: 'e2e/snapshots/{projectName}/{testFilePath}/{arg}{ext}',
+  expect: {
+    toHaveScreenshot: {
+      maxDiffPixelRatio: 0.02,
+      animations: 'disabled',
+    },
+  },
+});