feat: 新增代理预充值模块（DTO、Service、Handler、路由）

- agent_recharge_dto.go: 创建/列表/详情请求响应 DTO
- service.go: 权限验证（代理只能充自己店铺）、金额范围校验、查询 active 配置、创建订单、线下充值确认（乐观锁+审计日志）、回调幂等处理
- agent_recharge.go Handler: Create/List/Get/OfflinePay 共 4 个方法
- agent_recharge.go 路由: 注册到 /api/admin/agent-recharges/*，路由层拦截企业账号

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

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

internal/model/dto/agent_recharge_dto.go

@@ -0,0 +1,50 @@
+package dto
+
+// CreateAgentRechargeRequest 创建代理充值请求
+type CreateAgentRechargeRequest struct {
+	ShopID        uint   `json:"shop_id" validate:"required" required:"true" description:"目标店铺ID，代理只能填自己店铺"`
+	Amount        int64  `json:"amount" validate:"required,min=10000,max=100000000" required:"true" minimum:"10000" maximum:"100000000" description:"充值金额（分），范围100元~100万元"`
+	PaymentMethod string `json:"payment_method" validate:"required,oneof=wechat offline" required:"true" description:"支付方式 (wechat:微信在线支付, offline:线下转账仅平台可用)"`
+}
+
+// AgentOfflinePayRequest 代理线下充值确认请求
+type AgentOfflinePayRequest struct {
+	OperationPassword string `json:"operation_password" validate:"required" required:"true" description:"操作密码"`
+}
+
+// AgentRechargeResponse 代理充值记录响应
+type AgentRechargeResponse struct {
+	ID                   uint    `json:"id" description:"充值记录ID"`
+	RechargeNo           string  `json:"recharge_no" description:"充值单号(ARCH前缀)"`
+	ShopID               uint    `json:"shop_id" description:"店铺ID"`
+	ShopName             string  `json:"shop_name" description:"店铺名称"`
+	AgentWalletID        uint    `json:"agent_wallet_id" description:"代理钱包ID"`
+	Amount               int64   `json:"amount" description:"充值金额（分）"`
+	PaymentMethod        string  `json:"payment_method" description:"支付方式 (wechat:微信在线支付, offline:线下转账)"`
+	PaymentChannel       string  `json:"payment_channel" description:"实际支付通道 (wechat_direct:微信直连, fuyou:富友, offline:线下转账)"`
+	PaymentConfigID      *uint   `json:"payment_config_id" description:"关联支付配置ID，线下充值为null"`
+	PaymentTransactionID string  `json:"payment_transaction_id" description:"第三方支付流水号"`
+	Status               int     `json:"status" description:"状态 (1:待支付, 2:已完成, 3:已取消)"`
+	PaidAt               *string `json:"paid_at" description:"支付时间"`
+	CompletedAt          *string `json:"completed_at" description:"完成时间"`
+	CreatedAt            string  `json:"created_at" description:"创建时间"`
+	UpdatedAt            string  `json:"updated_at" description:"更新时间"`
+}
+
+// AgentRechargeListRequest 代理充值记录列表请求
+type AgentRechargeListRequest struct {
+	Page      int    `json:"page" query:"page" validate:"omitempty,min=1" minimum:"1" description:"页码，默认1"`
+	PageSize  int    `json:"page_size" query:"page_size" validate:"omitempty,min=1,max=100" minimum:"1" maximum:"100" description:"每页条数，默认20，最大100"`
+	ShopID    *uint  `json:"shop_id" query:"shop_id" description:"按店铺ID过滤"`
+	Status    *int   `json:"status" query:"status" description:"按状态过滤 (1:待支付, 2:已完成, 3:已取消)"`
+	StartDate string `json:"start_date" query:"start_date" description:"创建时间起始日期(YYYY-MM-DD)"`
+	EndDate   string `json:"end_date" query:"end_date" description:"创建时间截止日期(YYYY-MM-DD)"`
+}
+
+// AgentRechargeListResponse 代理充值记录列表响应
+type AgentRechargeListResponse struct {
+	Total    int64                    `json:"total" description:"总记录数"`
+	Page     int                      `json:"page" description:"当前页码"`
+	PageSize int                      `json:"page_size" description:"每页条数"`
+	List     []*AgentRechargeResponse `json:"list" description:"充值记录列表"`
+}