feat(credits): free points tasks matrix, day cap, and tasks tab

Add AKSRT_Points_Free for catalog/day-max/daily detail, wire the full
earn matrix (login, post, like, favorite, follow, comment, forum),
expose 积分任务 + 每日详情 tabs, and expand admin free-task settings.

inc/classes/class-aksrt-follow.php

@@ -47,7 +47,11 @@ class AKSRT_Follow {
             'created_at'   => current_time('mysql'),
         ], ['%d', '%d', '%s']);
 
-        return $result !== false;
+        if ($result === false) {
+            return false;
+        }
+        do_action('aksrt_user_followed', $follower_id, $following_id);
+        return true;
     }
 
     /**