feat(pickup): 新增管理员线下提号功能

- 新建 admin_pickups 表独立于 rental_orders，不污染订单状态机与财务统计口径
- 提号中/已完成/已取消三态：创建锁定账号，完成时给卖家钱包加可用余额并下架 listing，取消解锁账号
- 完成时 listing 置 completed，复用现有 listingLockedForOwnerMutation 拦截再上架
- 管理端提号管理页（列表/创建/完成/取消/可提号账号搜索）+ 卖家端提号记录页
- 财务仪表盘新增线下提号独立统计块，与正常订单口径分离
- 钱包流水 label、状态标签、菜单入口同步补齐
- 优化卖家服务悬浮菜单为一行四个，尺寸与配色对齐买家服务

backend/internal/modules/pickup/handler.go

@@ -0,0 +1,168 @@
+package pickup
+
+import (
+	"errors"
+	"net/http"
+	"strings"
+
+	"hfb_sys/backend/internal/auditlog"
+	"hfb_sys/backend/internal/middleware"
+	"hfb_sys/backend/pkg/response"
+
+	"github.com/gin-gonic/gin"
+)
+
+type Handler struct {
+	service *Service
+}
+
+func NewHandler(service *Service) *Handler {
+	return &Handler{service: service}
+}
+
+// Create 创建提号订单（管理员）
+func (h *Handler) Create(c *gin.Context) {
+	adminID, ok := currentAdminID(c)
+	if !ok {
+		response.Unauthorized(c, "缺少管理员上下文")
+		return
+	}
+	var req CreateRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "参数格式错误")
+		return
+	}
+	item, err := h.service.Create(c.Request.Context(), req, adminID, auditMeta(c))
+	if err != nil {
+		writePickupError(c, err)
+		return
+	}
+	response.OK(c, item)
+}
+
+// Complete 完成提号结算（管理员）
+func (h *Handler) Complete(c *gin.Context) {
+	adminID, ok := currentAdminID(c)
+	if !ok {
+		response.Unauthorized(c, "缺少管理员上下文")
+		return
+	}
+	id, ok := parseID(c)
+	if !ok {
+		return
+	}
+	var req CompleteRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "结算金额不正确")
+		return
+	}
+	item, err := h.service.Complete(c.Request.Context(), id, req, adminID, auditMeta(c))
+	if err != nil {
+		writePickupError(c, err)
+		return
+	}
+	response.OK(c, item)
+}
+
+// Cancel 取消提号（管理员）
+func (h *Handler) Cancel(c *gin.Context) {
+	adminID, ok := currentAdminID(c)
+	if !ok {
+		response.Unauthorized(c, "缺少管理员上下文")
+		return
+	}
+	id, ok := parseID(c)
+	if !ok {
+		return
+	}
+	var req CancelRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "取消原因不能为空")
+		return
+	}
+	if err := h.service.Cancel(c.Request.Context(), id, req.Reason, adminID, auditMeta(c)); err != nil {
+		writePickupError(c, err)
+		return
+	}
+	response.OK(c, gin.H{"cancelled": true})
+}
+
+// List 提号订单列表（管理员）
+func (h *Handler) List(c *gin.Context) {
+	query := parseAdminQuery(c)
+	result, err := h.service.ListAdmin(c.Request.Context(), query)
+	if err != nil {
+		writePickupError(c, err)
+		return
+	}
+	response.OK(c, result)
+}
+
+// Detail 提号订单详情（管理员）
+func (h *Handler) Detail(c *gin.Context) {
+	id, ok := parseID(c)
+	if !ok {
+		return
+	}
+	item, err := h.service.FindByID(c.Request.Context(), id)
+	if err != nil {
+		writePickupError(c, err)
+		return
+	}
+	response.OK(c, item)
+}
+
+// AvailableListings 可提号的 listing 搜索（管理员）
+func (h *Handler) AvailableListings(c *gin.Context) {
+	keyword := strings.TrimSpace(c.Query("keyword"))
+	page, pageSize := parsePagination(c)
+	result, err := h.service.ListAvailableListings(c.Request.Context(), keyword, page, pageSize)
+	if err != nil {
+		writePickupError(c, err)
+		return
+	}
+	response.OK(c, result)
+}
+
+// ListForSeller 卖家自己的提号记录
+func (h *Handler) ListForSeller(c *gin.Context) {
+	userID, ok := currentUserID(c)
+	if !ok {
+		response.Unauthorized(c, "缺少用户上下文")
+		return
+	}
+	query := parseSellerQuery(c)
+	result, err := h.service.ListForSeller(c.Request.Context(), userID, query)
+	if err != nil {
+		writePickupError(c, err)
+		return
+	}
+	response.OK(c, result)
+}
+
+func writePickupError(c *gin.Context, err error) {
+	switch {
+	case errors.Is(err, ErrDependencyUnavailable):
+		response.ServiceUnavailable(c, "数据库未连接")
+	case errors.Is(err, ErrListingUnavailable):
+		response.BadRequest(c, "账号不可用或已在交易中")
+	case errors.Is(err, ErrDuplicatePickup):
+		response.BadRequest(c, "该账号已有进行中的提号订单")
+	case errors.Is(err, ErrPickupNotFound):
+		response.Error(c, http.StatusNotFound, "pickup_not_found", "提号订单不存在")
+	case errors.Is(err, ErrPickupNotPickingUp):
+		response.BadRequest(c, "提号订单状态不允许该操作")
+	case errors.Is(err, ErrInvalidAmount):
+		response.BadRequest(c, "结算金额不正确")
+	default:
+		response.Error(c, http.StatusInternalServerError, "pickup_error", err.Error())
+	}
+}
+
+func auditMeta(c *gin.Context) auditlog.Meta {
+	return auditlog.Meta{
+		IP:        c.ClientIP(),
+		UserAgent: c.GetHeader("User-Agent"),
+		RequestID: middleware.GetRequestID(c),
+	}
+}