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/upload/index.ts

@@ -0,0 +1,5 @@
+export { UploadService } from './upload.service';
+export { AdminUploadService } from './admin-upload.service';
+export { formatFileSize, getFileUrl } from './utils';
+export type { ImageQuality } from './utils';
+export type { UploadImageResponse, Upload, ListUploadsResponse, FileStatsResponse } from './types';