feat: Implement user authentication and data management features

- Added LoginModal component for user login functionality.
- Introduced API routes for user login, favorites, play records, and search history management.
- Created JSON files for storing favorites, play records, and search history.
- Updated API service to handle new endpoints and refactored data management to use API calls instead of local storage.
- Adjusted data structures in types and services to align with new API responses.

backend/src/data/favorites.json

@@ -0,0 +1 @@
+{}

backend/src/data/playrecords.json

@@ -0,0 +1 @@
+{}

backend/src/data/searchhistory.json

@@ -0,0 +1 @@
+[]