feat(pickup): 线下提号支持扩展字段店铺管理CRUD及时间筛选

- 线下提号创建表单扩展：增加「操作人」、「第三方单号」、「下单金额」、「押金金额」字段，重构弹窗布局为紧凑双列/三列金额卡片排布，消除过度垂直滚动并默认预填操作人
- 店铺管理 CRUD：新增 pickup_shops 配置表与配套 API，支持在提号页面直接管理店铺（增删改查、启用/禁用、筛选），下拉选项自动优先加载活跃配置店铺并兼顾历史店铺
- 列表时间范围筛选：增加精确到秒的「日期+时间」时间范围选择器，支持快捷时段与后端时间范围过滤
- 生产环境数据核查：只读提取线上全部 61 项历史提号店铺名称与单量分布，完整整理沉淀至实施文档供后续映射规则参考
- 验证方式：执行并通过全套端到端代码门禁（scripts/check.sh：SQL约束、go vet、go build、MySQL真实测试库单元测试及覆盖率、vue大小检查、prettier、eslint、vue-tsc及vite构建）

backend/migrations/000079_admin_pickup_extra_fields_and_shops.sql

@@ -0,0 +1,35 @@
+-- +goose Up
+
+ALTER TABLE admin_pickups
+  ADD COLUMN operator VARCHAR(64) NOT NULL DEFAULT '' COMMENT '操作人' AFTER admin_id,
+  ADD COLUMN third_party_order_no VARCHAR(128) NOT NULL DEFAULT '' COMMENT '第三方订单号' AFTER platform,
+  ADD COLUMN order_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '下单金额(分)' AFTER listing_price_cent,
+  ADD COLUMN deposit_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '押金金额(分)' AFTER order_amount_cent,
+  ADD KEY idx_admin_pickups_third_party_order_no (third_party_order_no),
+  ADD KEY idx_admin_pickups_operator (operator);
+
+CREATE TABLE pickup_shops (
+  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+  name VARCHAR(100) NOT NULL COMMENT '店铺名称',
+  platform VARCHAR(32) NOT NULL DEFAULT '' COMMENT '所属平台(如淘宝/拼多多/闲鱼/微信等)',
+  status VARCHAR(20) NOT NULL DEFAULT 'active' COMMENT '状态: active启用/disabled禁用',
+  sort_order INT NOT NULL DEFAULT 0 COMMENT '排序权重',
+  remark VARCHAR(255) NOT NULL DEFAULT '' COMMENT '备注说明',
+  created_at DATETIME NOT NULL,
+  updated_at DATETIME NOT NULL,
+  PRIMARY KEY (id),
+  UNIQUE KEY uk_pickup_shop_name (name),
+  KEY idx_pickup_shop_status (status)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='线下提号店铺配置表';
+
+-- +goose Down
+
+DROP TABLE IF EXISTS pickup_shops;
+
+ALTER TABLE admin_pickups
+  DROP KEY idx_admin_pickups_third_party_order_no,
+  DROP KEY idx_admin_pickups_operator,
+  DROP COLUMN operator,
+  DROP COLUMN third_party_order_no,
+  DROP COLUMN order_amount_cent,
+  DROP COLUMN deposit_amount_cent;