新增场地信息管理功能，包括场地信息控制器、服务、数据模型及数据库表结构

sql/cms_outdoor_fair_bind_venue.sql

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+-- 户外招聘会绑定场地字段
+-- 瀚高数据库 / PostgreSQL 兼容
+-- 可重复执行。
+
+ALTER TABLE "cms_outdoor_fair"
+    ADD COLUMN IF NOT EXISTS "venue_id" BIGINT;
+
+ALTER TABLE "cms_outdoor_fair"
+    ADD COLUMN IF NOT EXISTS "venue_name" VARCHAR(200);
+
+COMMENT ON COLUMN "cms_outdoor_fair"."venue_id" IS '绑定场地ID';
+COMMENT ON COLUMN "cms_outdoor_fair"."venue_name" IS '绑定场地';
+
+CREATE INDEX IF NOT EXISTS "idx_cms_outdoor_fair_venue_id" ON "cms_outdoor_fair" ("venue_id");
+
+UPDATE "cms_outdoor_fair" fair
+SET "venue_name" = venue."venue_name",
+    "booth_count" = COALESCE(venue."floor_count", 0)
+FROM "cms_venue_info" venue
+WHERE fair."venue_id" = venue."id";