整理model

internal/model/dto.go

@@ -0,0 +1,12 @@
+package model
+
+// SongDetail is a DTO for API responses with joined artist/album names.
+// This is not a database model but a presentation-layer struct.
+type SongDetail struct {
+	ID       int    `json:"id"`
+	Title    string `json:"title"`
+	Artist   string `json:"artist"`
+	Album    string `json:"album"`
+	Duration int    `json:"duration"`
+	Path     string `json:"path"`
+}

internal/model/model.go

@@ -0,0 +1,53 @@
+package model
+
+import "time"
+
+// Library represents a music library directory.
+type Library struct {
+	ID        int       `json:"id"`
+	Name      string    `json:"name"`
+	Path      string    `json:"path"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+// MediaFile represents a single audio file on disk.
+type MediaFile struct {
+	ID         int       `json:"id"`
+	Path       string    `json:"path"`
+	LibraryID  int       `json:"library_id"`
+	FileSize   int64     `json:"file_size"`
+	Format     string    `json:"format"`
+	BitRate    int       `json:"bit_rate"`
+	SampleRate int       `json:"sample_rate"`
+	CreatedAt  time.Time `json:"created_at"`
+	UpdatedAt  time.Time `json:"updated_at"`
+}
+
+// Artist represents a music artist.
+type Artist struct {
+	ID   int    `json:"id"`
+	Name string `json:"name"`
+}
+
+// Album represents a music album.
+type Album struct {
+	ID       int    `json:"id"`
+	Title    string `json:"title"`
+	ArtistID int    `json:"artist_id"`
+	Cover    string `json:"cover"`
+	Year     int    `json:"year"`
+}
+
+// Song represents a single track within an album.
+type Song struct {
+	ID          int    `json:"id"`
+	Title       string `json:"title"`
+	ArtistID    int    `json:"artist_id"`
+	AlbumID     int    `json:"album_id"`
+	Duration    int    `json:"duration"`
+	MediaFileID int    `json:"media_file_id"`
+	TrackNumber int    `json:"track_number"`
+	DiscNumber  int    `json:"disc_number"`
+	Genre       string `json:"genre"`
+}