feat(subsonic): add getStarred and getStarred2 handlers

Both return user's starred artists/albums/songs sorted liked_at DESC.
Cap at 500 entries per category for v1 (Subsonic spec doesn't define
pagination on these endpoints; M3+ can revisit if needed).

internal/subsonic/types.go

@@ -211,6 +211,34 @@ type SearchResult3Response struct {
 	SearchResult3 SearchResult3Container `json:"searchResult3" xml:"searchResult3"`
 }
 
+// StarredContainer is the body of getStarred / getStarred2.
+type StarredContainer struct {
+	XMLName xml.Name    `json:"-" xml:"starred2"`
+	Artists []ArtistRef `json:"artist" xml:"artist"`
+	Albums  []AlbumRef  `json:"album" xml:"album"`
+	Songs   []SongRef   `json:"song" xml:"song"`
+}
+
+type GetStarred2Response struct {
+	Envelope
+	Starred2 StarredContainer `json:"starred2" xml:"starred2"`
+}
+
+// GetStarredContainer mirrors getStarred (id3-less variant). Response uses
+// the same shape; the only material difference from getStarred2 is the
+// outer key name.
+type GetStarredContainer struct {
+	XMLName xml.Name    `json:"-" xml:"starred"`
+	Artists []ArtistRef `json:"artist" xml:"artist"`
+	Albums  []AlbumRef  `json:"album" xml:"album"`
+	Songs   []SongRef   `json:"song" xml:"song"`
+}
+
+type GetStarredResponse struct {
+	Envelope
+	Starred GetStarredContainer `json:"starred" xml:"starred"`
+}
+
 // ---- conversion helpers ----
 
 func artistRef(a dbq.Artist, albumCount int) ArtistRef {