实现支付商户池与微信授权配置

新增收款商户、商户池轮询、微信授权配置独立管理；三类新支付
（C端套餐购买、C端资产钱包充值、代理在线预存款充值）无条件
经商户池选择并冻结路由，无旧综合配置回退。merchant_id 为空
历史支付继续按 payment_config_id 双读。凭证版本化加载与
ID+版本缓存保证轮换一致性。删除商户池新支付创建开关及全部
引用。

internal/handler/admin/payment_merchant.go

@@ -0,0 +1,218 @@
+package admin
+
+import (
+	"strconv"
+
+	"github.com/gofiber/fiber/v2"
+
+	merchantpayment "github.com/break/junhong_cmp_fiber/internal/application/merchantpayment"
+	"github.com/break/junhong_cmp_fiber/internal/model/dto"
+	"github.com/break/junhong_cmp_fiber/pkg/errors"
+	"github.com/break/junhong_cmp_fiber/pkg/response"
+)
+
+// PaymentMerchantHandler 处理特权商户与商户池配置请求。
+type PaymentMerchantHandler struct {
+	service *merchantpayment.ManagementService
+}
+
+// NewPaymentMerchantHandler 创建商户池管理处理器。
+func NewPaymentMerchantHandler(service *merchantpayment.ManagementService) *PaymentMerchantHandler {
+	return &PaymentMerchantHandler{service: service}
+}
+func pathID(c *fiber.Ctx) (uint, error) {
+	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
+	if err != nil || id == 0 {
+		return 0, errors.New(errors.CodeInvalidParam, "无效的路径ID")
+	}
+	return uint(id), nil
+}
+
+// CreateMerchant 创建支付商户。
+// POST /api/admin/payment-merchants
+func (h *PaymentMerchantHandler) CreateMerchant(c *fiber.Ctx) error {
+	var r dto.PaymentMerchantRequest
+	if err := c.BodyParser(&r); err != nil {
+		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
+	}
+	v, err := h.service.CreateMerchant(c.UserContext(), r)
+	if err != nil {
+		return err
+	}
+	return response.Success(c, v)
+}
+
+// ListMerchants 分页查询支付商户。
+// GET /api/admin/payment-merchants
+func (h *PaymentMerchantHandler) ListMerchants(c *fiber.Ctx) error {
+	var r dto.PaymentMerchantListRequest
+	if err := c.QueryParser(&r); err != nil {
+		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
+	}
+	v, n, err := h.service.ListMerchants(c.UserContext(), r)
+	if err != nil {
+		return err
+	}
+	return response.SuccessWithPagination(c, v, n, r.Page, r.PageSize)
+}
+
+// GetMerchant 查询支付商户详情。
+// GET /api/admin/payment-merchants/:id
+func (h *PaymentMerchantHandler) GetMerchant(c *fiber.Ctx) error {
+	id, err := pathID(c)
+	if err != nil {
+		return err
+	}
+	v, err := h.service.GetMerchant(c.UserContext(), id)
+	if err != nil {
+		return err
+	}
+	return response.Success(c, v)
+}
+
+// UpdateMerchant 更新支付商户。
+// PUT /api/admin/payment-merchants/:id
+func (h *PaymentMerchantHandler) UpdateMerchant(c *fiber.Ctx) error {
+	id, err := pathID(c)
+	if err != nil {
+		return err
+	}
+	var r dto.PaymentMerchantUpdateRequest
+	if err := c.BodyParser(&r); err != nil {
+		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
+	}
+	v, err := h.service.UpdateMerchant(c.UserContext(), id, r)
+	if err != nil {
+		return err
+	}
+	return response.Success(c, v)
+}
+
+// DeleteMerchant 删除支付商户。
+// DELETE /api/admin/payment-merchants/:id
+func (h *PaymentMerchantHandler) DeleteMerchant(c *fiber.Ctx) error {
+	id, err := pathID(c)
+	if err != nil {
+		return err
+	}
+	var r dto.PaymentMerchantDeleteRequest
+	if err := c.BodyParser(&r); err != nil {
+		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
+	}
+	if err := h.service.DeleteMerchant(c.UserContext(), id, r.Confirm); err != nil {
+		return err
+	}
+	return response.Success(c, nil)
+}
+
+// CreatePool 创建商户池。
+// POST /api/admin/payment-merchant-pools
+func (h *PaymentMerchantHandler) CreatePool(c *fiber.Ctx) error {
+	var r dto.PaymentMerchantPoolRequest
+	if err := c.BodyParser(&r); err != nil {
+		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
+	}
+	v, err := h.service.SavePool(c.UserContext(), 0, r)
+	if err != nil {
+		return err
+	}
+	return response.Success(c, v)
+}
+
+// UpdatePool 更新商户池。
+// PUT /api/admin/payment-merchant-pools/:id
+func (h *PaymentMerchantHandler) UpdatePool(c *fiber.Ctx) error {
+	id, err := pathID(c)
+	if err != nil {
+		return err
+	}
+	var r dto.PaymentMerchantPoolRequest
+	if err := c.BodyParser(&r); err != nil {
+		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
+	}
+	v, err := h.service.SavePool(c.UserContext(), id, r)
+	if err != nil {
+		return err
+	}
+	return response.Success(c, v)
+}
+
+// EnablePool 启用商户池。
+// POST /api/admin/payment-merchant-pools/:id/enable
+func (h *PaymentMerchantHandler) EnablePool(c *fiber.Ctx) error {
+	id, err := pathID(c)
+	if err != nil {
+		return err
+	}
+	result, err := h.service.SetPoolEnabled(c.UserContext(), id, true)
+	if err != nil {
+		return err
+	}
+	return response.Success(c, result)
+}
+
+// DisablePool 停用商户池。
+// POST /api/admin/payment-merchant-pools/:id/disable
+func (h *PaymentMerchantHandler) DisablePool(c *fiber.Ctx) error {
+	id, err := pathID(c)
+	if err != nil {
+		return err
+	}
+	result, err := h.service.SetPoolEnabled(c.UserContext(), id, false)
+	if err != nil {
+		return err
+	}
+	return response.Success(c, result)
+}
+
+// GetAuthorization 获取微信授权配置。
+// GET /api/admin/wechat-authorizations
+func (h *PaymentMerchantHandler) GetAuthorization(c *fiber.Ctx) error {
+	v, err := h.service.GetAuthorization(c.UserContext())
+	if err != nil {
+		return err
+	}
+	return response.Success(c, v)
+}
+
+// ListPools 分页查询商户池。
+// GET /api/admin/payment-merchant-pools
+func (h *PaymentMerchantHandler) ListPools(c *fiber.Ctx) error {
+	var r dto.PaymentMerchantPoolListRequest
+	if err := c.QueryParser(&r); err != nil {
+		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
+	}
+	v, total, err := h.service.ListPools(c.UserContext(), r)
+	if err != nil {
+		return err
+	}
+	return response.SuccessWithPagination(c, v, total, r.Page, r.PageSize)
+}
+
+// GetPool 查询商户池详情。
+// GET /api/admin/payment-merchant-pools/:id
+func (h *PaymentMerchantHandler) GetPool(c *fiber.Ctx) error {
+	id, err := pathID(c)
+	if err != nil {
+		return err
+	}
+	v, err := h.service.GetPool(c.UserContext(), id)
+	if err != nil {
+		return err
+	}
+	return response.Success(c, v)
+}
+
+// SaveAuthorization 保存微信授权配置。
+// PUT /api/admin/wechat-authorizations/current
+func (h *PaymentMerchantHandler) SaveAuthorization(c *fiber.Ctx) error {
+	var r dto.WechatAuthorizationRequest
+	if err := c.BodyParser(&r); err != nil {
+		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
+	}
+	v, err := h.service.SaveAuthorization(c.UserContext(), r)
+	if err != nil {
+		return err
+	}
+	return response.Success(c, v)
+}