feat: 订单/资产充值/代理充值模型新增 PaymentConfigID 字段

- order.go: Order 模型新增 PaymentConfigID *uint（记录下单时使用的支付配置）
- asset_wallet.go: AssetRechargeRecord 新增 PaymentConfigID *uint
- agent_wallet.go: AgentRechargeRecord 新增 PaymentConfigID *uint
配置切换时旧订单仍按 payment_config_id 加载对应配置验签，解决竞态问题

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

internal/model/agent_wallet.go

@@ -77,6 +77,7 @@ type AgentRechargeRecord struct {
 	PaymentMethod        string         `gorm:"column:payment_method;type:varchar(20);not null;comment:支付方式(alipay-支付宝 | wechat-微信 | bank-银行转账 | offline-线下)" json:"payment_method"`
 	PaymentChannel       *string        `gorm:"column:payment_channel;type:varchar(50);comment:支付渠道" json:"payment_channel,omitempty"`
 	PaymentTransactionID *string        `gorm:"column:payment_transaction_id;type:varchar(100);comment:第三方支付交易号" json:"payment_transaction_id,omitempty"`
+	PaymentConfigID      *uint          `gorm:"column:payment_config_id;index;comment:支付配置ID(关联tb_wechat_config.id)" json:"payment_config_id,omitempty"`
 	Status               int            `gorm:"column:status;type:int;not null;default:1;comment:充值状态(1-待支付 2-已支付 3-已完成 4-已关闭 5-已退款)" json:"status"`
 	PaidAt               *time.Time     `gorm:"column:paid_at;comment:支付时间" json:"paid_at,omitempty"`
 	CompletedAt          *time.Time     `gorm:"column:completed_at;comment:完成时间" json:"completed_at,omitempty"`

internal/model/asset_wallet.go

@@ -77,6 +77,7 @@ type AssetRechargeRecord struct {
 	PaymentMethod        string         `gorm:"column:payment_method;type:varchar(20);not null;comment:支付方式(alipay-支付宝 | wechat-微信)" json:"payment_method"`
 	PaymentChannel       *string        `gorm:"column:payment_channel;type:varchar(50);comment:支付渠道" json:"payment_channel,omitempty"`
 	PaymentTransactionID *string        `gorm:"column:payment_transaction_id;type:varchar(100);comment:第三方支付交易号" json:"payment_transaction_id,omitempty"`
+	PaymentConfigID      *uint          `gorm:"column:payment_config_id;index;comment:支付配置ID(关联tb_wechat_config.id)" json:"payment_config_id,omitempty"`
 	Status               int            `gorm:"column:status;type:int;not null;default:1;comment:充值状态(1-待支付 2-已支付 3-已完成 4-已关闭 5-已退款)" json:"status"`
 	PaidAt               *time.Time     `gorm:"column:paid_at;comment:支付时间" json:"paid_at,omitempty"`
 	CompletedAt          *time.Time     `gorm:"column:completed_at;comment:完成时间" json:"completed_at,omitempty"`

internal/model/order.go

@@ -55,6 +55,9 @@ type Order struct {
 
 	// 订单超时信息
 	ExpiresAt *time.Time `gorm:"column:expires_at;comment:订单过期时间(NULL表示不过期)" json:"expires_at,omitempty"`
+
+	// 支付配置
+	PaymentConfigID *uint `gorm:"column:payment_config_id;index;comment:支付配置ID(关联tb_wechat_config.id)" json:"payment_config_id,omitempty"`
 }
 
 // TableName 指定表名