feat(lyrics): add Netease Cloud Music as opt-in fallback source

Netease is queried only when server and LRCLIB both return nothing,
preserving the existing lyrics chain completely. Off by default.

- Rust command `fetch_netease_lyrics` proxies Netease API (CORS bypass)
- `src/api/netease.ts` TypeScript wrapper via invoke
- `authStore.enableNeteaselyrics` toggle (default: false)
- `useLyrics`: Netease fires last in fallback chain when enabled
- Settings toggle in the Lyrics section
- `lyricsSourceNetease` label in LyricsPane
- i18n: all 7 languages (en, de, fr, nl, nb, ru, zh)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/store/authStore.ts

@@ -53,6 +53,7 @@ interface AuthState {
   useCustomTitlebar: boolean;
   nowPlayingEnabled: boolean;
   lyricsServerFirst: boolean;
+  enableNeteaselyrics: boolean;
   showFullscreenLyrics: boolean;
   showChangelogOnUpdate: boolean;
   lastSeenChangelogVersion: string;
@@ -170,6 +171,7 @@ interface AuthState {
   setUseCustomTitlebar: (v: boolean) => void;
   setNowPlayingEnabled: (v: boolean) => void;
   setLyricsServerFirst: (v: boolean) => void;
+  setEnableNeteaselyrics: (v: boolean) => void;
   setShowFullscreenLyrics: (v: boolean) => void;
   setShowChangelogOnUpdate: (v: boolean) => void;
   setLastSeenChangelogVersion: (v: string) => void;
@@ -256,6 +258,7 @@ export const useAuthStore = create<AuthState>()(
       useCustomTitlebar: false,
       nowPlayingEnabled: false,
       lyricsServerFirst: true,
+      enableNeteaselyrics: false,
       showFullscreenLyrics: true,
       showChangelogOnUpdate: true,
       lastSeenChangelogVersion: '',
@@ -364,6 +367,7 @@ export const useAuthStore = create<AuthState>()(
       setUseCustomTitlebar: (v) => set({ useCustomTitlebar: v }),
       setNowPlayingEnabled: (v) => set({ nowPlayingEnabled: v }),
       setLyricsServerFirst: (v: boolean) => set({ lyricsServerFirst: v }),
+      setEnableNeteaselyrics: (v: boolean) => set({ enableNeteaselyrics: v }),
       setShowFullscreenLyrics: (v: boolean) => set({ showFullscreenLyrics: v }),
       setShowChangelogOnUpdate: (v) => set({ showChangelogOnUpdate: v }),
       setLastSeenChangelogVersion: (v) => set({ lastSeenChangelogVersion: v }),