feat: autotag mixed-bag splitting, search relevance fixes, and multi-library download imports

Autotag: detect "junk drawer" folders with no artist/album consensus
and split them into synthetic per-cluster groups instead of forcing
one match on an unrelated pile of tracks; repair tagging_items rows
left behind by a prior scan orphan-cleanup gap.

Explore: fix an exact artist-name search being drowned out by its own
catalog entries in intent-prior scoring, and prune stale in_library
bookkeeping left behind when a referenced library row is deleted.

Download: fix a multi-library regression where every import failed
with "no library root configured" — the importer resolved the
library root from a legacy single-library config field that nothing
populates in the current multi-library model. It now resolves the
destination library per-request from the request's own library_id.
Also widen the Soulseek search window (12s -> 20s), measured against
real request history to be missing available peers on live queries.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y2Agd9af5hE7qzti2ackiS

frontend/wailsjs/go/autotagservice/Service.d.ts

@@ -37,6 +37,8 @@ export function SetContext(arg1:context.Context):Promise<void>;
 
 export function Skip(arg1:string):Promise<void>;
 
+export function SplitMixedFolder(arg1:string):Promise<Array<autotagservice.PendingItem>>;
+
 export function StartAutotagQueue(arg1:number):Promise<void>;
 
 export function StartBackgroundPrefetch():Promise<void>;

frontend/wailsjs/go/autotagservice/Service.js

@@ -70,6 +70,10 @@ export function Skip(arg1) {
   return window['go']['autotagservice']['Service']['Skip'](arg1);
 }
 
+export function SplitMixedFolder(arg1) {
+  return window['go']['autotagservice']['Service']['SplitMixedFolder'](arg1);
+}
+
 export function StartAutotagQueue(arg1) {
   return window['go']['autotagservice']['Service']['StartAutotagQueue'](arg1);
 }

frontend/wailsjs/go/library/Library.d.ts

@@ -57,6 +57,8 @@ export function IsScanActive():Promise<boolean>;
 
 export function IsScanPaused():Promise<boolean>;
 
+export function LibraryPath(arg1:number):Promise<string>;
+
 export function PauseScan():Promise<void>;
 
 export function QueuedLibraryNames():Promise<Array<string>>;

frontend/wailsjs/go/library/Library.js

@@ -106,6 +106,10 @@ export function IsScanPaused() {
   return window['go']['library']['Library']['IsScanPaused']();
 }
 
+export function LibraryPath(arg1) {
+  return window['go']['library']['Library']['LibraryPath'](arg1);
+}
+
 export function PauseScan() {
   return window['go']['library']['Library']['PauseScan']();
 }

frontend/wailsjs/go/models.ts

@@ -207,6 +207,8 @@ export namespace autotagservice {
 	    bestMatchReleaseMbid: string;
 	    score: number;
 	    status: string;
+	    synthetic: boolean;
+	    likelyMixedBag: boolean;
 	
 	    static createFrom(source: any = {}) {
 	        return new PendingItem(source);
@@ -225,6 +227,8 @@ export namespace autotagservice {
 	        this.bestMatchReleaseMbid = source["bestMatchReleaseMbid"];
 	        this.score = source["score"];
 	        this.status = source["status"];
+	        this.synthetic = source["synthetic"];
+	        this.likelyMixedBag = source["likelyMixedBag"];
 	    }
 	}
 	
@@ -233,6 +237,8 @@ export namespace autotagservice {
 	    localTracks: LocalTrackView[];
 	    candidates: CandidateView[];
 	    recommendation: string;
+	    mixedBag: boolean;
+	    synthetic: boolean;
 	
 	    static createFrom(source: any = {}) {
 	        return new ScoreView(source);
@@ -244,6 +250,8 @@ export namespace autotagservice {
 	        this.localTracks = this.convertValues(source["localTracks"], LocalTrackView);
 	        this.candidates = this.convertValues(source["candidates"], CandidateView);
 	        this.recommendation = source["recommendation"];
+	        this.mixedBag = source["mixedBag"];
+	        this.synthetic = source["synthetic"];
 	    }
 	
 		convertValues(a: any, classs: any, asMap: boolean = false): any {
@@ -443,6 +451,7 @@ export namespace download {
 	    enabled: boolean;
 	    priority: number;
 	    settings: Record<string, string>;
+	    setSecrets?: Record<string, boolean>;
 	
 	    static createFrom(source: any = {}) {
 	        return new Config(source);
@@ -456,6 +465,7 @@ export namespace download {
 	        this.enabled = source["enabled"];
 	        this.priority = source["priority"];
 	        this.settings = source["settings"];
+	        this.setSecrets = source["setSecrets"];
 	    }
 	}
 	export class Field {
@@ -464,6 +474,7 @@ export namespace download {
 	    placeholder?: string;
 	    help?: string;
 	    secret: boolean;
+	    path: boolean;
 	    required: boolean;
 	    default?: string;
 	
@@ -478,6 +489,7 @@ export namespace download {
 	        this.placeholder = source["placeholder"];
 	        this.help = source["help"];
 	        this.secret = source["secret"];
+	        this.path = source["path"];
 	        this.required = source["required"];
 	        this.default = source["default"];
 	    }