refactor: 统一术语BOM为物料清单并补充工位扩展能力

主要变更：
1.  后端：重构工位管理逻辑，新增工位自定义扩展能力，将工位号上限调整为999并支持14+虚拟工位
2.  前后端：全量替换"BOM"术语为"物料清单"，包括提示语、注释和文档
3.  WMS模块：新增AGV任务取消接口与前端页面，对接海康RCS取消任务逻辑
4.  权限与种子数据：新增工位新增权限并更新权限配置
5.  修复错误校验逻辑，优化AGV客户端签名与请求处理

bj_power_wms/internal/handler/routes.go

@@ -94,6 +94,8 @@ func RegisterHandlers(server *rest.Server, ctx *svc.ServiceContext) {
 			{Method: http.MethodPost, Path: "/api/agv/refresh", Handler: requirePerm(ctx, "agv:manage", refreshAgvHandler(ctx))},
 			{Method: http.MethodGet, Path: "/api/agv/docks", Handler: requirePerm(ctx, "agv:manage", listDocksHandler(ctx))},
 			{Method: http.MethodGet, Path: "/api/agv/materials", Handler: requirePerm(ctx, "agv:manage", listAgvMaterialsHandler(ctx))},
+			{Method: http.MethodPost, Path: "/api/agv/cancel", Handler: requirePerm(ctx, "agv:manage", cancelAgvHandler(ctx))},
+			{Method: http.MethodGet, Path: "/api/agv/mode", Handler: requirePerm(ctx, "agv:manage", agvModeHandler(ctx))},
 		},
 	)