refactor: update database environment variables to use generic naming convention

realtime/src/helper/authdb.js

@@ -2,11 +2,11 @@ const { Pool } = require('pg');
 const { hash, generateShortId } = require('./cryptoUtils');
 
 const pool = new Pool({
-    user: process.env.POSTGRES_USER,
-    host: process.env.POSTGRES_HOST,
-    database: process.env.POSTGRES_NAME,
-    password: process.env.POSTGRES_PASSWORD,
-    port: process.env.POSTGRES_PORT,
+    user: process.env.DB_USER,
+    host: process.env.DB_HOST,
+    database: process.env.DB_NAME,
+    password: process.env.DB_PASSWORD,
+    port: process.env.DB_PORT,
 })
 
 async function checkDB() {
@@ -15,7 +15,6 @@ async function checkDB() {
         return true;
     } catch (error) {
         console.error('Database connection failed:', error);
-        
         return false;
     }
 }