feat: 添加 GET /api/payment/orders 接口，返回用户订单记录

src/db.rs

@@ -317,6 +317,26 @@ pub async fn update_user_profile(
 // ===== 支付系统 DB 函数 =====
 
 /// 创建待支付订单
+pub async fn get_user_orders(
+    pool: &PgPool,
+    user_id: i32,
+) -> Result<Vec<crate::models::PaymentOrder>, AppError> {
+    let rows = sqlx::query_as::<_, crate::models::PaymentOrder>(
+        r#"
+        SELECT id, user_id, order_no, package_type, amount, status, paid_at, expires_at, created_at
+        FROM payment_orders
+        WHERE user_id = $1
+        ORDER BY created_at DESC
+        "#,
+    )
+    .bind(user_id)
+    .fetch_all(pool)
+    .await
+    .map_err(|e| AppError::Database(format!("查询订单失败: {}", e)))?;
+
+    Ok(rows)
+}
+
 pub async fn create_payment_order(
     pool: &PgPool,
     user_id: i32,