Implement trackhasartist relationship management

Add complete implementation for track-artist relationship management,
  following the established albumhasgenre pattern. This enables tracking
  which artists are associated with each track in the media library.

  Changes:
  - Fix TrackHasArtist model: Rename from TrackHasArtistt.java (typo)
    and correct table name from "trackhasgenre" to "trackhasartist"
  - Implement TrackHasArtistRepository with full CRUD operations
  - Implement TrackHasArtistService with business logic and validation
  - Add TrackHasArtistMapper for entity/protobuf conversion
  - Create action handlers:
    * CreateTrackHasArtistHandler (trackhasartist.create)
    * DeleteTrackHasArtistHandler (trackhasartist.delete)
    * GetTrackHasArtistByIdHandler (trackhasartist.getById)
    * GetTrackHasArtistHandler (trackhasartist.getAll)
  - Register TrackHasArtistService in DelegateActionManager for
    automatic handler discovery and dependency injection
  - Proto file (trackhasartist.proto) was already correct

  The implementation validates track and artist existence before creating
  relationships and provides proper error handling with appropriate HTTP
  status codes.

  🤖 Generated with [Claude Code](https://claude.com/claude-code)

  Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/main/proto/trackhasartist.proto

@@ -0,0 +1,46 @@
+syntax = "proto3";
+
+option java_package = "com.mediamanager.protocol.messages";
+option java_outer_classname = "TrackHasArtistMessages";
+
+package mediamanager.messages;
+
+message TrackHasArtist{
+  int32 id = 1;
+  int32 fk_track_id = 2;
+  int32 fk_artist_id =3;
+}
+
+message CreateTrackHasArtistRequest {
+  int32 fk_track_id = 1;
+  int32 fk_artist_id = 2;
+}
+
+message CreateTrackHasArtistResponse {
+  TrackHasArtist trackhasartist = 1;
+}
+
+message GetTrackHasArtistsRequest {
+
+}
+
+message GetTrackHasArtistsResponse {
+  repeated TrackHasArtist trackhasartist = 1;
+}
+
+message GetTrackHasArtistByIdRequest {
+  int32 id = 1;
+}
+
+message GetTrackHasArtistByIdResponse {
+  TrackHasArtist trackhasartist = 1;
+}
+
+message DeleteTrackHasArtistRequest {
+  int32 id = 1;
+}
+
+message DeleteTrackHasArtistResponse {
+  bool success = 1;
+  string message = 2;
+}