Refactor map color threshold storage into dedicated settings service

backend/app/services/setup_service.py

@@ -15,16 +15,16 @@ import structlog
 
 from app.db import init_db, open_db
 from app.repositories import settings_repo
-from app.utils.async_utils import run_blocking
-from app.utils.setup_utils import (
+from app.services.settings_service import (
     get_map_color_thresholds as util_get_map_color_thresholds,
 )
+from app.services.settings_service import (
+    set_map_color_thresholds as util_set_map_color_thresholds,
+)
+from app.utils.async_utils import run_blocking
 from app.utils.setup_utils import (
     get_password_hash as util_get_password_hash,
 )
-from app.utils.setup_utils import (
-    set_map_color_thresholds as util_set_map_color_thresholds,
-)
 
 if TYPE_CHECKING:
     import aiosqlite