refactor(repo): consolidate openflare-server to root and move subprojects to internal/apps

- Merge all files inside openflare-server to the repository root directory.
- Relocate agent, relay, and flared subprojects from internal/ to internal/apps/.
- Combine docker-compose files and update build context paths to root.
- Update GitHub workflows and Dockerfiles to refer to new directories and package names.
- Rewrite Go package imports across all files.
- Resolve database renew test race condition and clean up docs.

frontend/lib/services/user/index.ts

@@ -0,0 +1,9 @@
+/**
+ * 用户服务模块
+ * 
+ * @description
+ * 提供用户个人设置相关的功能
+ */
+
+export { UserService } from './user.service';
+export type { AccessToken, CreateTokenResponse } from './user.service';