feat: Implement person and tag management services

- Added `Person` and `Tag` models to the core library.
- Created `PersonService` and `TagService` traits with implementations for managing persons and tags.
- Introduced repositories for `Person`, `Tag`, `FaceRegion`, and `PersonShare` with PostgreSQL support.
- Updated authorization logic to include permissions for accessing and editing persons.
- Enhanced the schema to support new models and relationships.
- Implemented database migrations for new tables related to persons and tags.
- Added request and response structures for API interactions with persons and tags.

libertas_api/src/handlers/mod.rs

@@ -2,3 +2,5 @@ pub mod album_handlers;
 pub mod auth_handlers;
 pub mod media_handlers;
 pub mod user_handlers;
+pub mod tag_handlers;
+pub mod person_handlers;