feat(platform): add endpoint to retrieve platform accounts for a user

- Introduced `getPlatformAccountsByUserId` method in `DyVideoUser` model to fetch active platform accounts for a specified user.
- Added new API route for accessing platform accounts under `v1/platform/accounts`, requiring user authentication.

app/api/model/DyVideoUser.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 namespace app\api\model;
 
 use think\Model;
+use think\Collection;
 
 /**
  * 授权账号模型（对应 dy_video_user 表）
@@ -32,4 +33,49 @@ class DyVideoUser extends Model
             ->where('disabled', 0)
             ->count();
     }
+
+    /**
+     * 获取当前用户的平台账号列表。
+     *
+     * 这里按 acgpmw `platform::index()` 和 `platform::get_zhanghu_list()` 的查询条件对齐：
+     * - 仅返回当前用户数据
+     * - 仅返回 `disabled=0` 的有效账号
+     * - 排序保持 `is_endauth desc, id desc`
+     *
+     * @param int $userid 用户ID
+     * @param int|null $platform 指定平台；为空时返回全部平台
+     * @return Collection
+     */
+    public static function getPlatformAccountsByUserId(int $userid, ?int $platform = null): Collection
+    {
+        $query = self::where('userid', $userid)
+            ->where('disabled', 0)
+            ->order(['is_endauth' => 'desc', 'id' => 'desc'])
+            ->field([
+                'id',
+                'userid',
+                'platform',
+                'is_lanv',
+                'is_endauth',
+                'aa_endauth',
+                'browser',
+                'is_qyh',
+                'proviceid',
+                'info_shouji',
+                'dy_avatar',
+                'dy_nickname',
+                'dy_intro',
+                'dy_account',
+                'dy_openid',
+                'dy_unique_id',
+                'addtime',
+                'updatetime',
+            ]);
+
+        if ($platform !== null) {
+            $query->where('platform', $platform);
+        }
+
+        return $query->select();
+    }
 }