修复数据库初始化的错误

server/db-schema-check.js

@@ -2,9 +2,9 @@
  * Database schema check
  * Ensures required tables and columns exist at startup.
  */
-require('dotenv').config();
-const db = require('./db');
 const path = require('path');
+require('dotenv').config({ path: path.join(__dirname, '..', '.env') });
+const db = require('./db');
 const fs = require('fs');
 
 const SCHEMA = {