refactor(api): use Annotated-style dependency injection

app/dependencies/fetcher.py

@@ -1,17 +1,21 @@
 from __future__ import annotations
 
+from typing import Annotated
+
 from app.config import settings
 from app.dependencies.database import get_redis
-from app.fetcher import Fetcher
+from app.fetcher import Fetcher as OriginFetcher
 from app.log import logger
 
-fetcher: Fetcher | None = None
+from fastapi import Depends
+
+fetcher: OriginFetcher | None = None
 
 
-async def get_fetcher() -> Fetcher:
+async def get_fetcher() -> OriginFetcher:
     global fetcher
     if fetcher is None:
-        fetcher = Fetcher(
+        fetcher = OriginFetcher(
             settings.fetcher_client_id,
             settings.fetcher_client_secret,
             settings.fetcher_scopes,
@@ -27,3 +31,6 @@ async def get_fetcher() -> Fetcher:
         if not fetcher.access_token or not fetcher.refresh_token:
             logger.opt(colors=True).info(f"Login to initialize fetcher: <y>{fetcher.authorize_url}</y>")
     return fetcher
+
+
+Fetcher = Annotated[OriginFetcher, Depends(get_fetcher)]