Centralise DbDep and mark Task 11 complete

backend/app/routers/blocklist.py

@@ -22,19 +22,16 @@ registered *before* the ``/{id}`` routes so FastAPI resolves them correctly.
 
 from __future__ import annotations
 
-from typing import Annotated
-
-import aiosqlite
-from fastapi import APIRouter, Depends, HTTPException, Query, status
+from fastapi import APIRouter, HTTPException, Query, status
 
 from app.dependencies import (
     AuthDep,
+    DbDep,
     Fail2BanSocketDep,
     GeoBatchLookupDep,
     HttpSessionDep,
     SchedulerDep,
     SettingsDep,
-    get_db,
 )
 from app.models.blocklist import (
     BlocklistListResponse,
@@ -52,8 +49,6 @@ from app.tasks.blocklist_import import run_import_with_resources
 
 router: APIRouter = APIRouter(prefix="/api/blocklists", tags=["Blocklists"])
 
-DbDep = Annotated[aiosqlite.Connection, Depends(get_db)]
-
 
 # ---------------------------------------------------------------------------
 # Source list + create