feat(11-01): per-library scan pipeline with queue coordinator

Task 1: Schema, events, and progress types
- Add library_id to CreateAudioFile SQL INSERT and regenerate sqlc code
- Add LibraryScanQueued and LibraryScanQueueDrained event constants
- Regenerate TypeScript events via genevents
- Add LibraryID, LibraryName, QueuedCount to ScanProgress
- Add LibraryID, LibraryName to ScanMetrics
- Add libraryID field to importResult for threading through pipeline

Task 2: Scan queue coordinator and per-library scanning
- Create scan_queue.go with ScanLibrary(id), ScanAllLibraries()
- Add CancelCurrentScan(), CancelAllScans() for queue-aware cancellation
- FIFO scan queue with silent dedup (same library already scanning or queued)
- Refactor Scan() -> scanInternal(libraryID, libraryName, libraryPath)
- Replace GetAllAudioFiles with GetAudioFilesByLibrary for per-library loading
- Thread libraryID through DB writer to set CreateAudioFileParams.LibraryID
- drainQueue auto-starts next queued library or emits LibraryScanQueueDrained
- Pause freezes current scan AND queue
- Add GetScanQueueLength() and QueuedLibraryNames() for UI
- Mark CancelScan() and Scan() as deprecated

backend/database/sql/sqlcgen/audio_files.sql.go

@@ -34,7 +34,7 @@ func (q *Queries) CountAudioFilesByLibrary(ctx context.Context, libraryID int64)
 }
 
 const createAudioFile = `-- name: CreateAudioFile :one
-INSERT INTO audio_files (file_path, length_milliseconds, file_type_id, recording_id, sample_rate, bit_depth, channels, bitrate, file_size, basename) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+INSERT INTO audio_files (file_path, length_milliseconds, file_type_id, recording_id, sample_rate, bit_depth, channels, bitrate, file_size, basename, library_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
 RETURNING id, file_path, length_milliseconds, file_type_id, recording_id, sample_rate, bit_depth, channels, bitrate, file_size, basename, library_id
 `
 
@@ -49,6 +49,7 @@ type CreateAudioFileParams struct {
 	Bitrate            int64
 	FileSize           int64
 	Basename           string
+	LibraryID          int64
 }
 
 func (q *Queries) CreateAudioFile(ctx context.Context, arg CreateAudioFileParams) (AudioFile, error) {
@@ -63,6 +64,7 @@ func (q *Queries) CreateAudioFile(ctx context.Context, arg CreateAudioFileParams
 		arg.Bitrate,
 		arg.FileSize,
 		arg.Basename,
+		arg.LibraryID,
 	)
 	var i AudioFile
 	err := row.Scan(