fix(server): 更新数据库环境变量命名以保持一致性

fix(WorkerDashboardView): 调整扫描器延迟并简化错误处理

backend/server.js

@@ -14,11 +14,11 @@ async function startServer() {
 
   // --- Database Connection ---
   const db = mysql.createPool({
-    host: process.env.DB_HOST,
-    user: process.env.DB_USER,
-    password: process.env.DB_PASSWORD,
-    database: process.env.DB_NAME,
-    port: process.env.DB_PORT || 3306,
+    host: process.env.DBHOST,
+    user: process.env.DBUSER,
+    password: process.env.DBPASSWORD,
+    database: process.env.DBNAME,
+    port: process.env.DBPORT,
     waitForConnections: true,
     connectionLimit: 10,
     queueLimit: 0,