feat: add in-game social test lab

src/core/db/users/migrations/add-is-test-account.sql

@@ -0,0 +1,18 @@
+ALTER TABLE `users`
+  ADD COLUMN IF NOT EXISTS `is_test_account` TINYINT(1) NOT NULL DEFAULT 0 COMMENT '是否为开发测试实验室账号' AFTER `role`;
+
+SET @test_account_index_exists := (
+  SELECT COUNT(*)
+  FROM information_schema.statistics
+  WHERE table_schema = DATABASE()
+    AND table_name = 'users'
+    AND index_name = 'idx_users_is_test_account'
+);
+SET @test_account_index_sql := IF(
+  @test_account_index_exists = 0,
+  'CREATE INDEX `idx_users_is_test_account` ON `users` (`is_test_account`)',
+  'SELECT 1'
+);
+PREPARE test_account_index_stmt FROM @test_account_index_sql;
+EXECUTE test_account_index_stmt;
+DEALLOCATE PREPARE test_account_index_stmt;