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>

e2e/visual/dashboard.spec.ts

@@ -0,0 +1,12 @@
+import { expect, test } from '../fixtures/auth';
+
+test('总览页面视觉基线', async ({ page }) => {
+  await page.goto('/dashboard');
+  await page.getByText('近7日对话趋势').waitFor();
+  await page.locator('canvas').first().waitFor();
+  await page.evaluate(() => document.fonts.ready);
+
+  await expect(page).toHaveScreenshot('dashboard.png', {
+    fullPage: true,
+  });
+});

e2e/visual/llm-models.spec.ts

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+import { expect, test } from '../fixtures/auth';
+
+test('模型列表视觉基线', async ({ page }) => {
+  await page.goto('/llm/models');
+  await page.getByRole('table').waitFor();
+  await page.evaluate(() => document.fonts.ready);
+
+  await expect(page).toHaveScreenshot('llm-models-list.png', {
+    fullPage: true,
+  });
+});

e2e/visual/llm-providers.spec.ts

@@ -0,0 +1,11 @@
+import { expect, test } from '../fixtures/auth';
+
+test('供应商管理视觉基线', async ({ page }) => {
+  await page.goto('/llm/providers');
+  await page.getByRole('table').waitFor();
+  await page.evaluate(() => document.fonts.ready);
+
+  await expect(page).toHaveScreenshot('llm-providers-list.png', {
+    fullPage: true,
+  });
+});