refactor(member, auth): streamline product info retrieval and enhance dashboard statistics

- Updated `getProductInfo` method in `Member` model to use a unified model for fetching product data.
- Refactored `logLogin` method to utilize `MemberLoginLog` for logging login attempts.
- Introduced `getDashboardStats` method in `AuthService` to gather user-specific statistics, including remaining quotas and counts of authorized accounts, published tasks, and works.
- Added new database configuration for Douyin business statistics.

app/api/model/MemberLoginLog.php

@@ -0,0 +1,32 @@
+<?php
+declare(strict_types=1);
+
+namespace app\api\model;
+
+use think\Model;
+
+/**
+ * 会员登录日志模型（对应 member_login_log 表）
+ *
+ * 这里封装登录日志写入，避免业务层直接拼接表名。
+ */
+class MemberLoginLog extends Model
+{
+    protected $connection = 'dbmember';
+
+    protected $name = 'member_login_log';
+
+    protected $autoWriteTimestamp = false;
+
+    /**
+     * 记录一次登录结果。
+     *
+     * @param array $payload 登录日志字段
+     * @return void
+     */
+    public static function recordLogin(array $payload): void
+    {
+        $model = new self();
+        $model->save($payload);
+    }
+}