feat: unfollow bangumi, change followState

lib/http/api.dart

@@ -320,6 +320,8 @@ class Api {
   // 取消追番
   static const String bangumiDel = '/pgc/web/follow/del';
 
+  static const String bangumiUpdate = '/pgc/web/follow/status/update';
+
   // 番剧列表
   // https://api.bilibili.com/pgc/season/index/result?
   // st=1&

lib/http/video.dart

@@ -766,6 +766,27 @@ class VideoHttp {
     }
   }
 
+  static Future bangumiUpdate({
+    dynamic seasonId,
+    dynamic status,
+  }) async {
+    var res = await Request().post(
+      Api.bangumiUpdate,
+      data: {
+        'season_id': seasonId,
+        'status': status,
+        'csrf': await Request.getCsrf(),
+      },
+      options: Options(
+        contentType: Headers.formUrlEncodedContentType,
+      ),
+    );
+    return {
+      'status': res.data['code'] == 0,
+      'msg': res.data['result'] == null ? 'failed' : res.data['result']['toast']
+    };
+  }
+
   // 查看视频同时在看人数
   static Future onlineTotal({int? aid, String? bvid, int? cid}) async {
     var res = await Request().get(Api.onlineTotal, data: {