Implement Track entity with complete CRUD operations

Add full Track implementation following the established pattern from Disc and Album entities.

  Components added:
  - Track entity model with relationships to Disc, Composer, BitDepth, BitRate, and SamplingRate
  - TrackRepository for data access layer with full CRUD operations
  - TrackService with business logic and validation
  - TrackMapper for protobuf/entity conversion
  - track.proto with all protobuf message definitions
  - Five action handlers: Create, GetAll, GetById, Update, Delete
  - TrackService registration in DelegateActionManager

  The Track entity supports:
  - Required fields: trackNumber, title, filepath, discId
  - Optional fields: duration, composerId, bitDepthId, bitRateId, samplingRateId
  - Full transaction management and error handling
  - Proper validation and logging throughout all layers

src/main/proto/track.proto

@@ -0,0 +1,81 @@
+syntax = "proto3";
+
+import "google/protobuf/wrappers.proto";
+
+option java_package = "com.mediamanager.protocol.messages";
+option java_outer_classname = "TrackMessages";
+
+package mediamanager.messages;
+
+message Track{
+  int32 id = 1;
+  int32 track_number = 2;
+  string title = 3;
+  int32 duration = 4;
+  string filepath = 5;
+
+  int32 fk_disc_id = 6;
+  int32 fk_composer_id = 7;
+  int32 fk_bitdepth_id = 8;
+  int32 fk_bitrate_id = 9;
+  int32 fk_samplingrate_id = 10;
+}
+
+message CreateTrackRequest {
+  int32 track_number = 1;
+  string title = 2;
+  google.protobuf.Int32Value duration = 3;
+  string filepath = 4;
+
+  int32 fk_disc_id = 5;
+  google.protobuf.Int32Value fk_composer_id = 6;
+  google.protobuf.Int32Value fk_bitdepth_id = 7;
+  google.protobuf.Int32Value fk_bitrate_id = 8;
+  google.protobuf.Int32Value fk_samplingrate_id = 9;
+}
+
+message CreateTrackResponse {
+  Track track = 1;
+}
+
+message GetTracksRequest {
+}
+
+message GetTracksResponse {
+  repeated Track tracks = 1;
+}
+
+message GetTrackByIdRequest {
+  int32 id = 1;
+}
+
+message GetTrackByIdResponse {
+  Track track = 1;
+}
+
+message UpdateTrackRequest {
+  int32 id = 1;
+  google.protobuf.Int32Value track_number = 2;
+  string title = 3;
+  google.protobuf.Int32Value duration = 4;
+  string filepath = 5;
+
+  google.protobuf.Int32Value fk_disc_id = 6;
+  google.protobuf.Int32Value fk_composer_id = 7;
+  google.protobuf.Int32Value fk_bitdepth_id = 8;
+  google.protobuf.Int32Value fk_bitrate_id = 9;
+  google.protobuf.Int32Value fk_samplingrate_id = 10;
+}
+
+message UpdateTrackResponse {
+  Track track = 1;
+}
+
+message DeleteTrackRequest {
+  int32 id = 1;
+}
+
+message DeleteTrackResponse {
+  bool success = 1;
+  string message = 2;
+}