- Define SoraObjectStorage interface abstracting S3 and GDrive backends
- Implement SoraGDriveStorage with OAuth2 and Service Account auth
- Add SoraStorageRouter to route requests based on active profile provider
- Add GDrive OAuth handler for authorization flow (start + callback)
- Extend profile model with provider, auth_type, and GDrive-specific fields
- Update frontend UI with provider selection, dynamic form fields, and i18n
- Migrate API paths from /sora-s3 to /sora-storage (old paths preserved)
- All existing S3 functionality remains backward compatible
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>