Fix geo_re_resolve async mocks and mark tasks complete

backend/app/services/geo_service.py

@@ -30,7 +30,8 @@ Usage::
         # single lookup
         info = await geo_service.lookup("1.2.3.4", session)
         if info:
-            print(info.country_code)  # "DE"
+            # info.country_code == "DE"
+            ...  # use the GeoInfo object in your application
 
         # bulk lookup (more efficient for large sets)
         geo_map = await geo_service.lookup_batch(["1.2.3.4", "5.6.7.8"], session)
@@ -42,7 +43,7 @@ import asyncio
 import time
 from collections.abc import Awaitable, Callable
 from dataclasses import dataclass
-from typing import TYPE_CHECKING, TypeAlias
+from typing import TYPE_CHECKING
 
 import aiohttp
 import structlog
@@ -119,7 +120,7 @@ class GeoInfo:
     """Organisation name associated with the IP, e.g. ``"Deutsche Telekom"``."""
 
 
-GeoEnricher: TypeAlias = Callable[[str], Awaitable[GeoInfo | None]]
+type GeoEnricher = Callable[[str], Awaitable[GeoInfo | None]]
 """Async callable used to enrich IPs with :class:`~app.services.geo_service.GeoInfo`.
 
 This is a shared type alias used by services that optionally accept a geo