fix(db): create_db_tables 목록에 Comment·VideoReaction 테이블 추가

신규 DB 셋업 시 두 테이블이 생성되지 않아 /video/all 등 댓글·좋아요
조회가 즉시 실패하던 누락을 보완한다.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CVSeUT2pEmeHc6hG6gVXUS

app/database/session.py

@@ -80,7 +80,8 @@ async def create_db_tables():
     from app.home.models import Image, Project, MarketingIntel, ImageTag  # noqa: F401
     from app.lyric.models import Lyric  # noqa: F401
     from app.song.models import Song, SongTimestamp  # noqa: F401
-    from app.video.models import Video  # noqa: F401
+    from app.video.models import Video, VideoReaction  # noqa: F401
+    from app.comment.models import Comment  # noqa: F401
     from app.sns.models import SNSUploadTask  # noqa: F401
     from app.social.models import SocialUpload  # noqa: F401
     from app.dashboard.models import Dashboard  # noqa: F401
@@ -98,6 +99,8 @@ async def create_db_tables():
         Song.__table__,
         SongTimestamp.__table__,
         Video.__table__,
+        VideoReaction.__table__,
+        Comment.__table__,
         SNSUploadTask.__table__,
         SocialUpload.__table__,
         MarketingIntel.__table__,