feat: 接入微信小程序支付

docs/technical/SPACETIMEDB_TABLE_CATALOG.md

@@ -328,7 +328,8 @@ SELECT * FROM profile_membership WHERE user_id = '<user_id>';
 ### `profile_recharge_order`
 
 - 作用：充值订单表，记录用户购买光点或会员的订单、支付渠道、支付时间、积分变更和会员到期时间。
-- 结构：`order_id PK: String`, `user_id: String`, `product_id: String`, `product_title: String`, `kind: RuntimeProfileRechargeProductKind`, `amount_cents: u64`, `status: RuntimeProfileRechargeOrderStatus`, `payment_channel: String`, `paid_at: Timestamp`, `created_at: Timestamp`, `points_delta: i64`, `membership_expires_at: Option<Timestamp>`。
+- 结构：`order_id PK: String`, `user_id: String`, `product_id: String`, `product_title: String`, `kind: RuntimeProfileRechargeProductKind`, `amount_cents: u64`, `status: RuntimeProfileRechargeOrderStatus`, `payment_channel: String`, `paid_at: Option<Timestamp>`, `provider_transaction_id: Option<String>`, `created_at: Timestamp`, `points_delta: i64`, `membership_expires_at: Option<Timestamp>`。
+- 支付口径：`mock` 渠道创建后立即 `paid` 并入账；微信小程序 `wechat_mp` 渠道创建时为 `pending`，微信支付通知确认后改为 `paid`，`provider_transaction_id` 保存微信支付平台订单号。
 - 索引：`user_id`, `(user_id, created_at)`。
 
 ```sql