refactor: 移除 LiteLLM proxy 架构，后端直连 Provider API

- 移除 backend/scripts/build_litellm_proxy_config.py
- 简化 LiteLLMService，移除 run_completion_with_cost 方法
- AgentScopeRunner 改为从 LlmFactory 获取 api_base 和 api_key
- 部署配置移除 litellm/litellm-config-job 服务
- Flutter 新增 AuthBootScreen 引导页
- Android 添加通知权限 (POST_NOTIFICATIONS, RECEIVE_BOOT_COMPLETED, SCHEDULE_EXACT_ALARM)
- 优化 LocalNotificationService 调度失败 fallback
- 更新 manifest.json (version 3)

deploy/static/releases/manifest.json

@@ -4,23 +4,12 @@
       "platform": "android",
       "channel": "release",
       "version_name": "0.1.0",
-      "version_code": 1,
-      "min_supported_version_code": 1,
-      "file_name": "social-app-android-v0.1.0+1-release.apk",
-      "release_notes": "\u95ee\u9898\u4fee\u590d\u548c\u4f53\u9a8c\u4f18\u5316",
-      "file_size": 21371504,
-      "sha256": "6cf53601f36e0037b6de909ea3567d1e18a1bcec1164e1b70d88c1802eafd44b"
-    },
-    {
-      "platform": "android",
-      "channel": "release",
-      "version_name": "0.1.0",
-      "version_code": 2,
-      "min_supported_version_code": 2,
-      "file_name": "social-app-android-v0.1.0+2-release.apk",
-      "release_notes": "\u95ee\u9898\u4fee\u590d\u548c\u4f53\u9a8c\u4f18\u5316",
-      "file_size": 21371504,
-      "sha256": "8f769bda3ba5414dfd5712ac026d8a13663990b7e83a4e92b8e85caf9945d5eb"
+      "version_code": 3,
+      "min_supported_version_code": 3,
+      "file_name": "social-app-android-v0.1.0+3-release.apk",
+      "release_notes": null,
+      "file_size": 21371568,
+      "sha256": "34691f96004b3dc3b2070d84ae0e7f0d2943f6c9978160eb78550081bc72a74a"
     }
   ]
 }