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

package-lock.json

@@ -0,0 +1,76 @@
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+      "license": "Apache-2.0",
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+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
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+      "engines": {
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+      "license": "Apache-2.0",
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+}