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/handler/admin/agent_recharge.go

@@ -0,0 +1,91 @@
+package admin
+
+import (
+	"strconv"
+
+	"github.com/gofiber/fiber/v2"
+
+	"github.com/break/junhong_cmp_fiber/internal/model/dto"
+	agentRechargeSvc "github.com/break/junhong_cmp_fiber/internal/service/agent_recharge"
+	"github.com/break/junhong_cmp_fiber/pkg/errors"
+	"github.com/break/junhong_cmp_fiber/pkg/response"
+)
+
+// AgentRechargeHandler 代理预充值 Handler
+type AgentRechargeHandler struct {
+	service *agentRechargeSvc.Service
+}
+
+// NewAgentRechargeHandler 创建代理预充值 Handler
+func NewAgentRechargeHandler(service *agentRechargeSvc.Service) *AgentRechargeHandler {
+	return &AgentRechargeHandler{service: service}
+}
+
+// Create 创建代理充值订单
+// POST /api/admin/agent-recharges
+func (h *AgentRechargeHandler) Create(c *fiber.Ctx) error {
+	var req dto.CreateAgentRechargeRequest
+	if err := c.BodyParser(&req); err != nil {
+		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
+	}
+
+	result, err := h.service.Create(c.UserContext(), &req)
+	if err != nil {
+		return err
+	}
+
+	return response.Success(c, result)
+}
+
+// List 查询代理充值订单列表
+// GET /api/admin/agent-recharges
+func (h *AgentRechargeHandler) List(c *fiber.Ctx) error {
+	var req dto.AgentRechargeListRequest
+	if err := c.QueryParser(&req); err != nil {
+		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
+	}
+
+	list, total, err := h.service.List(c.UserContext(), &req)
+	if err != nil {
+		return err
+	}
+
+	return response.SuccessWithPagination(c, list, total, req.Page, req.PageSize)
+}
+
+// Get 查询代理充值订单详情
+// GET /api/admin/agent-recharges/:id
+func (h *AgentRechargeHandler) Get(c *fiber.Ctx) error {
+	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
+	if err != nil {
+		return errors.New(errors.CodeInvalidParam, "无效的充值记录ID")
+	}
+
+	result, err := h.service.GetByID(c.UserContext(), uint(id))
+	if err != nil {
+		return err
+	}
+
+	return response.Success(c, result)
+}
+
+// OfflinePay 确认线下充值
+// POST /api/admin/agent-recharges/:id/offline-pay
+func (h *AgentRechargeHandler) OfflinePay(c *fiber.Ctx) error {
+	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
+	if err != nil {
+		return errors.New(errors.CodeInvalidParam, "无效的充值记录ID")
+	}
+
+	var req dto.AgentOfflinePayRequest
+	if err := c.BodyParser(&req); err != nil {
+		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
+	}
+
+	result, err := h.service.OfflinePay(c.UserContext(), uint(id), &req)
+	if err != nil {
+		return err
+	}
+
+	return response.Success(c, result)
+}