feat: Add Cross-Domain Job Fair and Alliance City Management

- Implemented AppOutdoorFairController for outdoor job fair public H5 interfaces.
- Created CrossCityAllianceController for managing cross-domain alliance cities.
- Added CrossCityAlliance domain model and corresponding service and mapper.
- Developed CrossDomainJobVO for aggregating job data across job fairs.
- Created SQL scripts for initializing the cross-city alliance table and modifying the public job fair schema.
- Added migration script for backing up and restoring the HighGo database schema.

sql/cms_cross_city_alliance.sql

@@ -0,0 +1,67 @@
+-- 跨域联合招聘会 - 联盟城市表
+-- 用于「各地市就业信息」Tab 的联盟城市筛选与管理（替代前端硬编码 mock）。
+-- 依赖：sys_menu 已存在 menu_id=2114「跨域联合招聘会管理」（parent_id=2055）。
+
+CREATE SEQUENCE IF NOT EXISTS shz.cms_cross_city_alliance_id_seq
+    START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1;
+
+CREATE TABLE IF NOT EXISTS shz.cms_cross_city_alliance (
+    id          BIGINT       NOT NULL DEFAULT nextval('shz.cms_cross_city_alliance_id_seq'::regclass) PRIMARY KEY,
+    name        VARCHAR(64)  NOT NULL,
+    create_by   VARCHAR(64),
+    create_time TIMESTAMP,
+    update_by   VARCHAR(64),
+    update_time TIMESTAMP,
+    remark      VARCHAR(500),
+    del_flag    CHAR(1)      DEFAULT '0'
+);
+
+COMMENT ON TABLE  shz.cms_cross_city_alliance IS '跨域联合招聘会-联盟城市表';
+COMMENT ON COLUMN shz.cms_cross_city_alliance.id       IS '主键';
+COMMENT ON COLUMN shz.cms_cross_city_alliance.name     IS '城市名称';
+COMMENT ON COLUMN shz.cms_cross_city_alliance.del_flag IS '删除标志（0存在 2删除）';
+
+-- 种子：8 个联盟城市（与原前端 mock 一致），仅在表为空时插入
+INSERT INTO shz.cms_cross_city_alliance (name, create_by, create_time, del_flag)
+SELECT * FROM (VALUES
+    ('乌鲁木齐市',      'admin', now(), '0'),
+    ('克拉玛依市',      'admin', now(), '0'),
+    ('昌吉回族自治州',  'admin', now(), '0'),
+    ('哈密市',          'admin', now(), '0'),
+    ('吐鲁番市',        'admin', now(), '0'),
+    ('喀什地区',        'admin', now(), '0'),
+    ('阿克苏地区',      'admin', now(), '0'),
+    ('伊犁哈萨克自治州','admin', now(), '0')
+) AS seed(name, create_by, create_time, del_flag)
+WHERE NOT EXISTS (SELECT 1 FROM shz.cms_cross_city_alliance);
+
+-- 给已存在的页面菜单 2114 补上 perms（仅当为空时）
+UPDATE sys_menu
+SET perms = 'cms:crossCityFair:list', update_by = 'system', update_time = now()
+WHERE menu_id = 2114 AND (perms IS NULL OR perms = '');
+
+-- 新增 4 个按钮权限（仅在不存在时插入）
+INSERT INTO sys_menu (menu_name, parent_id, order_num, path, component, query, route_name, is_frame, is_cache, menu_type, visible, status, perms, icon, create_by, create_time, remark)
+SELECT btn.menu_name, 2114, btn.order_num, '', NULL, NULL, '', 1, 0, 'F', '0', '0', btn.perms, '#', 'system', now(), '跨域联合招聘会-按钮'
+FROM (VALUES
+    ('联盟城市查询', 1, 'cms:crossCityFair:query'),
+    ('联盟城市新增', 2, 'cms:crossCityFair:add'),
+    ('联盟城市修改', 3, 'cms:crossCityFair:edit'),
+    ('联盟城市删除', 4, 'cms:crossCityFair:remove')
+) AS btn(menu_name, order_num, perms)
+WHERE NOT EXISTS (SELECT 1 FROM sys_menu WHERE perms = btn.perms);
+
+-- 授权：把上述按钮权限授予拥有 menu_id=2114 的角色
+WITH cross_roles AS (
+    SELECT DISTINCT role_id FROM sys_role_menu WHERE menu_id = 2114
+),
+new_menus AS (
+    SELECT menu_id FROM sys_menu
+    WHERE perms IN ('cms:crossCityFair:query','cms:crossCityFair:add','cms:crossCityFair:edit','cms:crossCityFair:remove')
+),
+rows AS (
+    SELECT cross_roles.role_id, new_menus.menu_id FROM cross_roles CROSS JOIN new_menus
+)
+INSERT INTO sys_role_menu (role_id, menu_id)
+SELECT rows.role_id, rows.menu_id FROM rows
+WHERE NOT EXISTS (SELECT 1 FROM sys_role_menu ex WHERE ex.role_id = rows.role_id AND ex.menu_id = rows.menu_id);

sql/public_job_fair_cross_domain_cities.sql

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+-- 公共招聘会：新增「跨域联盟城市」列，存逗号分隔的城市名称。
+-- 依赖：shz.public_job_fair 已存在；shz.cms_cross_city_alliance 提供城市数据。
+
+ALTER TABLE public_job_fair
+    ADD COLUMN IF NOT EXISTS cross_domain_cities VARCHAR(500);
+
+COMMENT ON COLUMN public_job_fair.cross_domain_cities IS '跨域联盟城市（逗号分隔的城市名称）';