feat(discovery): Navidrome AudioMuse-AI client integration and library scoping

Add per-server toggle for AudioMuse-style discovery: Instant Mix via
getSimilarSongs, server similar artists instead of Last.fm on artist pages,
and higher similar-artist count in Now Playing when enabled.

When browsing a single music folder, filter similar/top song results by
album ids from that scope (Navidrome does not apply musicFolderId to those
endpoints). Request larger similar batches under a narrow scope.

Keep radio-from-track as two blocks (shuffled top songs, then shuffled
similar-by-artist) so it differs from Instant Mix. Show Alpha badge beside
the setting. Add research/ to .gitignore.

src/locales/de.ts

@@ -94,6 +94,7 @@ export const deTranslation = {
     addToQueue: 'Zur Warteschlange hinzufügen',
     enqueueAlbum: 'Ganzes Album einreihen',
     startRadio: 'Radio starten',
+    instantMix: 'Instant Mix',
     lfmLove: 'Auf Last.fm liken',
     lfmUnlove: 'Last.fm-Like entfernen',
     favorite: 'Favorisieren',
@@ -396,6 +397,9 @@ export const deTranslation = {
     testBtn: 'Verbindung testen',
     testingBtn: 'Teste…',
     serverCompatible: 'Kompatibel mit: Navidrome · Gonic · Airsonic · Subsonic',
+    audiomuseTitle: 'AudioMuse-AI (Navidrome)',
+    audiomuseDesc:
+      'Aktivieren, wenn dieser Server das AudioMuse-AI-Navidrome-Plugin nutzt. Schaltet Instant Mix pro Titel frei und nutzt ähnliche Künstler vom Server statt Last.fm auf Künstlerseiten.',
     connected: 'Verbunden',
     failed: 'Fehlgeschlagen',
     eqTitle: 'Equalizer',

src/locales/en.ts

@@ -95,6 +95,7 @@ export const enTranslation = {
     addToQueue: 'Add to Queue',
     enqueueAlbum: 'Enqueue Album',
     startRadio: 'Start Radio',
+    instantMix: 'Instant Mix',
     lfmLove: 'Love on Last.fm',
     lfmUnlove: 'Unlove on Last.fm',
     favorite: 'Favorite',
@@ -397,6 +398,9 @@ export const enTranslation = {
     testBtn: 'Test Connection',
     testingBtn: 'Testing…',
     serverCompatible: 'Compatible with: Navidrome · Gonic · Airsonic · Subsonic',
+    audiomuseTitle: 'AudioMuse-AI (Navidrome)',
+    audiomuseDesc:
+      'Turn on if this server has the AudioMuse-AI Navidrome plugin configured. Enables Instant Mix from tracks and uses server-side similar artists instead of Last.fm on artist pages.',
     connected: 'Connected',
     failed: 'Failed',
     eqTitle: 'Equalizer',

src/locales/fr.ts

@@ -94,6 +94,7 @@ export const frTranslation = {
     addToQueue: 'Ajouter à la file',
     enqueueAlbum: 'Mettre l\'album en file',
     startRadio: 'Démarrer la radio',
+    instantMix: 'Mix instantané',
     lfmLove: 'Aimer sur Last.fm',
     lfmUnlove: 'Ne plus aimer sur Last.fm',
     favorite: 'Favori',
@@ -396,6 +397,9 @@ export const frTranslation = {
     testBtn: 'Tester la connexion',
     testingBtn: 'Test en cours…',
     serverCompatible: 'Compatible avec : Navidrome · Gonic · Airsonic · Subsonic',
+    audiomuseTitle: 'AudioMuse-AI (Navidrome)',
+    audiomuseDesc:
+      'Activez si ce serveur utilise le plugin Navidrome AudioMuse-AI. Active le mix instantané depuis un morceau et affiche les artistes similaires côté serveur au lieu de Last.fm sur les pages artiste.',
     connected: 'Connecté',
     failed: 'Échec',
     eqTitle: 'Égaliseur',

src/locales/nb.ts

@@ -94,6 +94,7 @@ export const nbTranslation = {
     addToQueue: 'Legg til i kø',
     enqueueAlbum: 'Legg albumet i kø',
     startRadio: 'Start radio',
+    instantMix: 'Instant Mix',
     lfmLove: 'Lik på Last.fm',
     lfmUnlove: 'Fjern fra likte på Last.fm',
     favorite: 'Favoritt',
@@ -396,6 +397,9 @@ export const nbTranslation = {
     testBtn: 'Test tilkobling',
     testingBtn: 'Tester…',
     serverCompatible: 'Kompatibel med: Navidrome · Gonic · Airsonic · Subsonic',
+    audiomuseTitle: 'AudioMuse-AI (Navidrome)',
+    audiomuseDesc:
+      'Slå på hvis denne serveren bruker AudioMuse-AI Navidrome-plugin. Aktiverer Instant Mix fra spor og henter lignende artister fra serveren i stedet for Last.fm på artistsider.',
     connected: 'Tilkoblet',
     failed: 'Mislyktes',
     eqTitle: 'Jevnstiller',

src/locales/nl.ts

@@ -94,6 +94,7 @@ export const nlTranslation = {
     addToQueue: 'Aan wachtrij toevoegen',
     enqueueAlbum: 'Album in wachtrij',
     startRadio: 'Radio starten',
+    instantMix: 'Instant Mix',
     lfmLove: 'Liken op Last.fm',
     lfmUnlove: 'Niet meer liken op Last.fm',
     favorite: 'Favoriet',
@@ -396,6 +397,9 @@ export const nlTranslation = {
     testBtn: 'Verbinding testen',
     testingBtn: 'Testen…',
     serverCompatible: 'Compatibel met: Navidrome · Gonic · Airsonic · Subsonic',
+    audiomuseTitle: 'AudioMuse-AI (Navidrome)',
+    audiomuseDesc:
+      'Zet aan als deze server de AudioMuse-AI Navidrome-plugin gebruikt. Schakelt Instant Mix per nummer in en toont vergelijkbare artiesten van de server i.p.v. Last.fm op artiestpagina’s.',
     connected: 'Verbonden',
     failed: 'Mislukt',
     eqTitle: 'Equalizer',

src/locales/ru.ts

@@ -95,6 +95,7 @@ export const ruTranslation = {
     addToQueue: 'В конец очереди',
     enqueueAlbum: 'Альбом в очередь',
     startRadio: 'Радио по похожим',
+    instantMix: 'Instant Mix',
     lfmLove: 'Любимое на Last.fm',
     lfmUnlove: 'Убрать с Last.fm',
     favorite: 'В избранное',
@@ -411,6 +412,9 @@ export const ruTranslation = {
     testBtn: 'Проверить',
     testingBtn: 'Проверка…',
     serverCompatible: 'Совместимость: Navidrome · Gonic · Airsonic · Subsonic',
+    audiomuseTitle: 'AudioMuse-AI (Navidrome)',
+    audiomuseDesc:
+      'Включите, если на этом сервере настроен плагин AudioMuse-AI для Navidrome. Появится Instant Mix для треков, а на странице исполнителя похожие будут браться с сервера вместо Last.fm.',
     connected: 'Подключено',
     failed: 'Ошибка',
     eqTitle: 'Эквалайзер',

src/locales/zh.ts

@@ -94,6 +94,7 @@ export const zhTranslation = {
     addToQueue: '添加到队列',
     enqueueAlbum: '专辑加入队列',
     startRadio: '开始电台',
+    instantMix: '即时混音',
     lfmLove: '在 Last.fm 上标记喜欢',
     lfmUnlove: '取消 Last.fm 喜欢标记',
     favorite: '收藏',
@@ -392,6 +393,9 @@ export const zhTranslation = {
     testBtn: '测试连接',
     testingBtn: '正在测试…',
     serverCompatible: '兼容：Navidrome · Gonic · Airsonic · Subsonic',
+    audiomuseTitle: 'AudioMuse-AI（Navidrome）',
+    audiomuseDesc:
+      '若此服务器已配置 AudioMuse-AI Navidrome 插件请开启。可从曲目启动即时混音，并在艺人页使用服务器返回的相似艺人，而非 Last.fm。',
     connected: '已连接',
     failed: '失败',
     eqTitle: '均衡器',