feat: add calendar view with Bangumi.tv schedule integration

Add weekly broadcast schedule page showing subscribed anime grouped by
day-of-week. Backend fetches air_weekday from Bangumi.tv calendar API
and matches titles. Frontend displays responsive grid (desktop) and
vertical list (mobile). Edit popup moved to parent layout to fix
KeepAlive conflicts, and restyled with purple theme.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/src/module/database/combine.py

@@ -1,3 +1,6 @@
+import logging
+
+from sqlalchemy import inspect, text
 from sqlmodel import Session, SQLModel
 
 from module.models import Bangumi, User
@@ -9,6 +12,8 @@ from .rss import RSSDatabase
 from .torrent import TorrentDatabase
 from .user import UserDatabase
 
+logger = logging.getLogger(__name__)
+
 
 class Database(Session):
     def __init__(self, engine=e):
@@ -21,6 +26,20 @@ class Database(Session):
 
     def create_table(self):
         SQLModel.metadata.create_all(self.engine)
+        self._migrate_columns()
+
+    def _migrate_columns(self):
+        """Add new columns to existing tables if they don't exist."""
+        inspector = inspect(self.engine)
+        if "bangumi" in inspector.get_table_names():
+            columns = [col["name"] for col in inspector.get_columns("bangumi")]
+            if "air_weekday" not in columns:
+                with self.engine.connect() as conn:
+                    conn.execute(
+                        text("ALTER TABLE bangumi ADD COLUMN air_weekday INTEGER")
+                    )
+                    conn.commit()
+                logger.info("[Database] Migrated: added air_weekday column to bangumi table.")
 
     def drop_table(self):
         SQLModel.metadata.drop_all(self.engine)