fix: remove double-call on AsyncSession in SerieScanner

get_async_session_factory() returns session directly, not factory.
Calling result again with () caused 'AsyncSession' object is not callable.

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

src/core/SerieScanner.py

@@ -218,8 +218,7 @@ class SerieScanner:
         try:
             from src.server.database.connection import get_async_session_factory
 
-            session_factory = get_async_session_factory()
-            db = session_factory()
+            db = get_async_session_factory()
             try:
                 existing = await AnimeSeriesService.get_by_key(db, serie.key)
                 if existing: