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>

webui/src/api/bangumi.ts

@@ -13,6 +13,7 @@ export const apiBangumi = {
       ...bangumi,
       filter: bangumi.filter.split(','),
       rss_link: bangumi.rss_link.split(','),
+      air_weekday: bangumi.air_weekday ?? null,
     }));
     return result;
   },
@@ -30,6 +31,7 @@ export const apiBangumi = {
       ...data,
       filter: data.filter.split(','),
       rss_link: data.rss_link.split(','),
+      air_weekday: data.air_weekday ?? null,
     };
     return result;
   },
@@ -134,4 +136,14 @@ export const apiBangumi = {
     );
     return data;
   },
+
+  /**
+   * 从 Bangumi.tv 刷新放送日历数据
+   */
+  async refreshCalendar() {
+    const { data } = await axios.get<ApiSuccess>(
+      'api/v1/bangumi/refresh/calendar'
+    );
+    return data;
+  },
 };