feat: configure hot leagues in match center

docs/sql/alter_la_league_add_is_hot.sql

@@ -0,0 +1,17 @@
+-- 联赛管理增加“热门联赛”配置字段，可重复执行。
+SET @schema_name = DATABASE();
+SET @has_is_hot = (
+    SELECT COUNT(*)
+    FROM information_schema.COLUMNS
+    WHERE TABLE_SCHEMA = @schema_name
+      AND TABLE_NAME = 'la_league'
+      AND COLUMN_NAME = 'is_hot'
+);
+SET @alter_sql = IF(
+    @has_is_hot = 0,
+    'ALTER TABLE `la_league` ADD COLUMN `is_hot` tinyint unsigned NOT NULL DEFAULT 0 COMMENT ''是否热门联赛: 0=否 1=是'' AFTER `is_show`',
+    'SELECT ''la_league.is_hot already exists'''
+);
+PREPARE alter_stmt FROM @alter_sql;
+EXECUTE alter_stmt;
+DEALLOCATE PREPARE alter_stmt;

docs/sql/create_la_league.sql

@@ -16,6 +16,7 @@ CREATE TABLE `la_league` (
   `icon` varchar(500) NOT NULL DEFAULT '' COMMENT '联赛图标 URL',
   `sort` int NOT NULL DEFAULT 0 COMMENT '排序权重（越小越靠前）',
   `is_show` tinyint unsigned NOT NULL DEFAULT 1 COMMENT '是否显示: 0=隐藏 1=显示',
+  `is_hot` tinyint unsigned NOT NULL DEFAULT 0 COMMENT '是否热门联赛: 0=否 1=是',
   `extra_data` json DEFAULT NULL COMMENT '额外数据（如 calendar 等）',
   `create_time` int unsigned NOT NULL DEFAULT 0 COMMENT '创建时间',
   `update_time` int unsigned NOT NULL DEFAULT 0 COMMENT '更新时间',