refactor(admin): streamline sound scanning route to use scheduler service and require admin role

app/routes/admin_sounds.py

@@ -4,6 +4,7 @@ from flask import Blueprint, jsonify, request
 
 from app.services.decorators import require_admin, require_auth, require_role
 from app.services.error_handling_service import ErrorHandlingService
+from app.services.scheduler_service import scheduler_service
 from app.services.sound_normalizer_service import SoundNormalizerService
 from app.services.sound_scanner_service import SoundScannerService
 
@@ -11,13 +12,11 @@ bp = Blueprint("admin_sounds", __name__)
 
 
 @bp.route("/scan", methods=["POST"])
-@require_auth
-@require_role("admin")
+@require_admin
 def scan_sounds():
     """Manually trigger sound scanning."""
-    return ErrorHandlingService.wrap_service_call(
-        SoundScannerService.scan_soundboard_directory,
-        request.get_json().get("directory") if request.get_json() else None,
+    return ErrorHandlingService.handle_service_result(
+        scheduler_service.trigger_sound_scan_now()
     )