style(audiobooks): cosmetic cleanups in scaffolded package

Two pre-emptive cleanups flagged by code review before sub-plan 2
copies the patterns:

  1. Sort the internal/audiobooks import after internal/adminjob in
     cmd/silo/main.go (alphabetical).
  2. Drop the redundant "audiobooks: " prefix from the Enabled() error
     wrap; matches how every other top-level service package
     (watchstate, scanqueue, metadata, etc.) formats errors.

No behavior change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cmd/silo/main.go

@@ -29,8 +29,8 @@ import (
 	pluginv1 "github.com/Silo-Server/silo-plugin-sdk/pkg/pluginproto/silo/plugin/v1"
 
 	"github.com/Silo-Server/silo-server/internal/activitylog"
-	"github.com/Silo-Server/silo-server/internal/audiobooks"
 	"github.com/Silo-Server/silo-server/internal/adminjob"
+	"github.com/Silo-Server/silo-server/internal/audiobooks"
 	"github.com/Silo-Server/silo-server/internal/api"
 	"github.com/Silo-Server/silo-server/internal/api/handlers"
 	"github.com/Silo-Server/silo-server/internal/auth"

internal/audiobooks/service.go

@@ -37,7 +37,7 @@ func (s *Service) Enabled(ctx context.Context) (bool, error) {
 	}
 	value, err := s.settings.GetString(ctx, "audiobooks.enabled")
 	if err != nil {
-		return false, fmt.Errorf("audiobooks: read audiobooks.enabled: %w", err)
+		return false, fmt.Errorf("read audiobooks.enabled: %w", err)
 	}
 	return value == "true", nil
 }