feat: 接入法制日报机构并新增 15 应用 Playwright 回归测试

- 新增法制日报机构种子数据（机构/用户/分类/15应用/知识库），登录页默认账号预填
- 引入 Playwright e2e：登录复用 storageState，覆盖对话/补全/工作流/智能体四类交互
- 配置测试脚本与产物 gitignore

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

apps/web/playwright.config.ts

@@ -0,0 +1,36 @@
+import { defineConfig, devices } from "@playwright/test";
+
+const BASE_URL = process.env.E2E_BASE_URL || "http://localhost:3000";
+
+export default defineConfig({
+  testDir: "./e2e",
+  outputDir: "./e2e/.artifacts",
+  fullyParallel: false,
+  forbidOnly: !!process.env.CI,
+  retries: 0,
+  workers: 2,
+  reporter: [["list"], ["html", { outputFolder: "./e2e/.report", open: "never" }]],
+  timeout: 120_000,
+  expect: { timeout: 90_000 },
+  use: {
+    baseURL: BASE_URL,
+    trace: "retain-on-failure",
+    screenshot: "only-on-failure",
+    actionTimeout: 30_000,
+    locale: "zh-CN",
+  },
+  projects: [
+    {
+      name: "setup",
+      testMatch: /auth\.setup\.ts/,
+    },
+    {
+      name: "apps",
+      use: {
+        ...devices["Desktop Chrome"],
+        storageState: "./e2e/.auth/state.json",
+      },
+      dependencies: ["setup"],
+    },
+  ],
+});