chore: фронт :3107, API :3001 (Docker, Vite, CORS, доки)

- compose: testing-web 3107:80, testing-backend 3001:3001, PORT+FRONTEND_URL
- nginx → testing-backend:3001; Vite 3107, proxy /api → 3001
- server default PORT 3001; Dockerfile EXPOSE 3001; CORS dev — localhost:3107
- README, журнал, user guide

Made-with: Cursor

backend/src/app.js

@@ -16,9 +16,8 @@ export function createApp() {
         ? [process.env.FRONTEND_URL]
         : []
       : [
-          'http://localhost:5173',
+          'http://localhost:3107',
           'http://localhost:3000',
-          'http://localhost:8080',
         ];
   app.use(
     cors({

backend/src/server.js

@@ -1,7 +1,7 @@
 import { createApp } from './app.js';
 
 const app = createApp();
-const PORT = process.env.PORT || 3107;
+const PORT = process.env.PORT || 3001;
 app.listen(PORT, () => {
   console.log(`Server is running on port ${PORT}`);
   console.log(`Environment: ${process.env.NODE_ENV || 'development'}`);