chore: 后端首次基线提交

运行必须源码：app/(controller/model/service/middleware/lib/utils/validate/router)、config/、database/(migrations/seeders/sql)、启动脚本、app/public/templates 模板。
已忽略运行非必须：node_modules/、logs/、run/、app/public 运行时上传数据、.env*、构建/缓存产物。

add_word_cols.js

@@ -0,0 +1,23 @@
+const mysql = require('mysql2/promise');
+(async () => {
+  const c = await mysql.createConnection({
+    host: 'localhost', user: 'root', password: '74191221', database: 'competition_db'
+  });
+  try {
+    await c.query("ALTER TABLE exam_submissions ADD COLUMN word_file_path VARCHAR(500) NULL DEFAULT NULL COMMENT 'Word答案文件路径' AFTER answers");
+    console.log('Added word_file_path');
+  } catch (e) {
+    if (e.code === 'ER_DUP_FIELDNAME') console.log('word_file_path exists');
+    else throw e;
+  }
+  try {
+    await c.query("ALTER TABLE exam_submissions ADD COLUMN word_file_name VARCHAR(255) NULL DEFAULT NULL COMMENT 'Word答案文件名' AFTER word_file_path");
+    console.log('Added word_file_name');
+  } catch (e) {
+    if (e.code === 'ER_DUP_FIELDNAME') console.log('word_file_name exists');
+    else throw e;
+  }
+  const [cols] = await c.query('SHOW COLUMNS FROM exam_submissions');
+  cols.forEach(x => console.log(x.Field, x.Type, x.Null));
+  await c.end();
+})();