docs(sql): add biz_collection_region_staff migration

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/sql/migrations/2026-09-18-collection-region-staff.sql

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+-- 采集地区 — 工作人员绑定（可多名负责人）
+-- Spec: docs/superpowers/specs/2026-09-18-collection-region-staff-binding-design.md
+
+SET NAMES utf8mb4;
+
+CREATE TABLE IF NOT EXISTS `biz_collection_region_staff` (
+  `id` varchar(64) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '主键ID',
+  `region_id` varchar(64) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '采集地区ID',
+  `user_id` varchar(64) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '系统用户ID',
+  `is_leader` tinyint(4) NOT NULL DEFAULT '0' COMMENT '是否地区负责人 1是0否',
+  `tenant_no` varchar(64) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT 'zkxw' COMMENT '租户编号',
+  `order_num` int(11) DEFAULT NULL COMMENT '排序号',
+  `remark` varchar(512) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '备注',
+  `create_by` varchar(64) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '创建人id',
+  `create_dept_id` varchar(64) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '' COMMENT '创建人部门ID',
+  `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+  `update_by` varchar(64) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '更新人id',
+  `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+  `del_flag` tinyint(4) NOT NULL DEFAULT '0' COMMENT '删除标记：0-正常 1-已删除',
+  PRIMARY KEY (`id`) USING BTREE,
+  KEY `idx_crs_region` (`region_id`, `del_flag`) USING BTREE,
+  KEY `idx_crs_user` (`user_id`, `del_flag`) USING BTREE,
+  KEY `idx_crs_tenant` (`tenant_no`, `del_flag`) USING BTREE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='采集地区工作人员';