chore(db): clean legacy sql assets and standardize migrations

src/main/resources/db/migration/V10__create_mt_venue_table.sql

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+-- =====================================================
+-- Migration: Create legacy mt_venue table for mini module compatibility
+-- Version: V10
+-- Description: Add mt_venue table if not exists
+-- Date: 2026-02-15
+-- =====================================================
+
+CREATE TABLE IF NOT EXISTS `mt_venue` (
+  `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键ID',
+  `competition_id` bigint NOT NULL COMMENT '赛事ID',
+  `venue_name` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '场地名称',
+  `venue_no` int NOT NULL COMMENT '场地编号',
+  `status` int DEFAULT '1' COMMENT '场地状态：1-正常，2-维护中',
+  `create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+  `update_time` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+  `is_deleted` tinyint DEFAULT '0' COMMENT '是否删除：0-否，1-是',
+  `tenant_id` varchar(12) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci DEFAULT '000000' COMMENT '租户ID',
+  `create_user` bigint DEFAULT NULL COMMENT '创建人',
+  `create_dept` bigint DEFAULT NULL COMMENT '创建部门',
+  `update_user` bigint DEFAULT NULL COMMENT '更新人',
+  PRIMARY KEY (`id`) USING BTREE,
+  KEY `idx_competition_id` (`competition_id`) USING BTREE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci ROW_FORMAT=DYNAMIC COMMENT='场地表';