feat(pickup): 店铺管理支持历史店铺可视化手动映射与一键批量清洗

- 数据库升级：新增 pickup_shop_mappings 映射别名表，并在 admin_pickups 增加 raw_shop_name 永久保留原始店铺录入值
- 后端映射能力：提供历史店铺聚合统计、单条/批量映射至目标标准店铺、映射规则撤销与提号单还原接口；新建提号时若录入已映射别名自动归一化
- 前端管理升级：PickupShopDialog 升级为双 Tab 结构，Tab 2「历史店铺映射与清洗」支持总览统计卡片、状态筛选、单条/批量映射清洗、一键设为标准店铺及撤销还原
- 验证方式：执行并通过全套代码门禁（scripts/check.sh：SQL约束、go vet/build/test、MySQL测试库覆盖率、vue大小、eslint、prettier、vue-tsc及vite构建）

backend/internal/router/router.go

@@ -763,6 +763,9 @@ func New(cfg config.Config, deps Dependencies, logger *zap.Logger) *gin.Engine {
 			adminRoutes.POST("/pickups/shops", requirePerm("order:pickup"), pickupHandler.CreateShop)
 			adminRoutes.PUT("/pickups/shops/:id", requirePerm("order:pickup"), pickupHandler.UpdateShop)
 			adminRoutes.DELETE("/pickups/shops/:id", requirePerm("order:pickup"), pickupHandler.DeleteShop)
+			adminRoutes.GET("/pickups/shops/historical-stats", requirePerm("order:pickup"), pickupHandler.GetHistoricalShopStats)
+			adminRoutes.POST("/pickups/shops/map-historical", requirePerm("order:pickup"), pickupHandler.MapHistoricalShops)
+			adminRoutes.DELETE("/pickups/shops/mappings", requirePerm("order:pickup"), pickupHandler.DeleteShopMapping)
 			adminRoutes.GET("/pickups/available-listings", requirePerm("order:pickup"), pickupHandler.AvailableListings)
 			adminRoutes.GET("/pickups/:id/financial-adjustments", requirePerm("order:pickup"), pickupHandler.ListFinancialAdjustments)
 			adminRoutes.GET("/pickups/:id/process-events", requirePerm("order:pickup"), pickupHandler.ProcessEvents)