Remove repository import from setup_utils and move password-hash helper to setup service

backend/app/services/setup_service.py

@@ -22,9 +22,6 @@ 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,
-)
 
 if TYPE_CHECKING:
     import aiosqlite
@@ -131,7 +128,7 @@ async def run_setup(
 
 async def get_password_hash(db: aiosqlite.Connection) -> str | None:
     """Return the stored bcrypt password hash, or ``None`` if not set."""
-    return await util_get_password_hash(db)
+    return await settings_repo.get_setting(db, _KEY_PASSWORD_HASH)
 
 
 async def get_runtime_database_path(db: aiosqlite.Connection) -> str | None: