feat: 集成 KieAI 服务，移除 models-integration 子项目

- 添加 Gemini 2.5 Flash 对话接口（流式+非流式）
- 添加 NanoBanana 图像生成/编辑接口
- 添加 Sora2 视频生成接口（文生视频、图生视频、去水印）
- 移除 models-integration 子项目（功能已迁移至主后端）
- 新增测试文档和 Playwright E2E 配置
- 更新前端页面和 API 接口
- 更新后端配置和日志处理

tests/e2e/helpers/app-helpers.ts

@@ -0,0 +1,77 @@
+import { Page, FrameLocator, Locator } from '@playwright/test';
+
+/** App base URL (H5 dev server) */
+export const BASE_URL = 'http://localhost:8080';
+
+/** Credentials for demo account */
+export const TEST_CREDENTIALS = {
+  phone: '18621813282',
+  password: 'A123456',
+};
+
+/**
+ * Returns the frame or page to interact with.
+ * If the page has a #iframe element (pc.html wrapper), use the frame context;
+ * otherwise use the page directly.
+ */
+export async function getAppContext(page: Page): Promise<Page | FrameLocator> {
+  const hasIframe = await page.locator('#iframe').count();
+  if (hasIframe > 0) {
+    return page.frameLocator('#iframe');
+  }
+  return page;
+}
+
+/**
+ * Navigate to an internal UniApp hash route.
+ * Works whether we are inside an iframe or directly on root.
+ */
+export async function goToPage(page: Page, route: string): Promise<void> {
+  await page.goto(`${BASE_URL}/#/${route}`);
+  // Brief wait for Vue router & components to hydrate
+  await page.waitForTimeout(1500);
+}
+
+/**
+ * Perform login flow using phone + password.
+ * Expects to already be on the login page or navigates there.
+ */
+export async function login(
+  page: Page,
+  phone = TEST_CREDENTIALS.phone,
+  password = TEST_CREDENTIALS.password,
+): Promise<void> {
+  await goToPage(page, 'pages/users/login/index');
+
+  // UniApp H5 renders <input> as native HTML input elements
+  const phoneInput = page.locator('input[type="number"], input[placeholder*="手机号"]').first();
+  const passwordInput = page.locator('input[type="password"], input[placeholder*="密码"]').first();
+
+  await phoneInput.waitFor({ state: 'visible', timeout: 10_000 });
+  await phoneInput.fill(phone);
+  await passwordInput.fill(password);
+
+  // Agree to terms (checkbox-group)
+  const checkbox = page.locator('uni-checkbox, .checkbox').first();
+  const isChecked = await checkbox.getAttribute('checked').catch(() => null);
+  if (!isChecked || isChecked === 'false') {
+    await checkbox.click().catch(() => {
+      // Fallback: click the parent checkbox-group
+      return page.locator('uni-checkbox-group, .checkgroup').first().click();
+    });
+  }
+
+  // Click login button (current === 0 → "账号登录" button)
+  const loginBtn = page.locator('.logon').first();
+  await loginBtn.click();
+
+  // Wait for navigation away from login page
+  await page.waitForTimeout(3000);
+}
+
+/**
+ * Wait until the UniApp page finishes mounting (title or key element appears).
+ */
+export async function waitForPageReady(page: Page, selector: string, timeout = 10_000): Promise<void> {
+  await page.locator(selector).waitFor({ state: 'visible', timeout });
+}