Changes:
- Add generic image upload API endpoint (POST /user/upload-image)
- Add uploadImage method in StorageService for backend
- Add uploadImage method in AccountService for frontend
- Add selfApplyStatus and selfApplyAuthorization methods in AuthorizationService
- Replace mock data with real API calls in authorization apply page
- Add API endpoints for self-apply status and self-apply authorization
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
hailin