T-10: Fix get_geo_batch_lookup for proper injection with GeoCache instance

Instead of returning a bound method (geo_cache.lookup_batch), now inject
the GeoCache instance directly into routers and services. This provides
proper runtime isolation since T-04 made GeoCache a proper object.

Changes:
- Remove get_geo_batch_lookup() dependency provider
- Add GeoCacheDep type alias for injecting GeoCache instances
- Update all routers (bans, blocklist, dashboard, jails) to use GeoCacheDep
- Update ban_service, blocklist_service, jail_service to accept GeoCache
- Update service protocols to match new signatures
- Update docstrings to reference GeoCache methods instead of module functions

All callers now call geo_cache.lookup_batch(...) directly instead of
geo_batch_lookup(...), providing real dependency injection with proper
testing isolation.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/app/services/protocols.py

@@ -38,7 +38,8 @@ if TYPE_CHECKING:
         MapColorThresholdsUpdate,
         RegexTestResponse,
     )
-    from app.models.geo import GeoBatchLookup, GeoEnricher, GeoInfo
+    from app.models.geo import GeoEnricher, GeoInfo
+    from app.services.geo_cache import GeoCache
     from app.models.history import HistoryListResponse, IpDetailResponse
     from app.models.jail import JailDetailResponse, JailListResponse
     from app.models.server import ServerSettingsResponse, ServerSettingsUpdate, ServerStatus
@@ -188,7 +189,7 @@ class BlocklistService(Protocol):
         db: aiosqlite.Connection,
         *,
         geo_is_cached: Callable[[str], bool] | None = None,
-        geo_batch_lookup: GeoBatchLookup | None = None,
+        geo_cache: GeoCache | None = None,
         ban_ip: Callable[[str, str, str], Awaitable[None]],
     ) -> ImportSourceResult:
         ...
@@ -201,7 +202,7 @@ class BlocklistService(Protocol):
         *,
         ban_ip: Callable[[str, str, str], Awaitable[None]],
         geo_is_cached: Callable[[str], bool] | None = None,
-        geo_batch_lookup: GeoBatchLookup | None = None,
+        geo_cache: GeoCache | None = None,
     ) -> ImportRunResult:
         ...