- Added FirebaseAuth struct and TokenVerifier interface for verifying Firebase ID tokens.
- Introduced FirebaseConfig struct in config to manage Firebase credentials and project ID.
- Implemented OAuth handler for Firebase ID token verification in HTTP handlers.
- Added middleware for authenticating requests using Firebase tokens.
- Updated router to conditionally apply authentication based on configuration.
- Created tests for the new authentication middleware.
- Added request and response types for Firebase OAuth handling.
- Included a sample JSON file for testing purposes.
- Implemented FetchEpisode function to retrieve episode metadata from dアニメストア.
- Added /api/v1/danime GET endpoint to fetch episode details by partId.
- Updated Swagger documentation for the new endpoint and response structure.
- Created DanimeEpisodeResponse type for API responses.
- Added tests for the new functionality and handlers.
