fix: serve on port 80 to match Coolify/Traefik routing config

Dockerfile

@@ -36,6 +36,6 @@ COPY --from=frontend-build /app/frontend/dist ./public
 COPY start.sh ./
 RUN chmod +x start.sh
 
-EXPOSE 3000
+EXPOSE 80
 
 CMD ["./start.sh"]

backend/src/index.ts

@@ -22,7 +22,7 @@ import settingsRouter from './routes/settings';
 import notificationsRouter from './routes/notifications';
 
 const app = express();
-const PORT = parseInt(process.env.PORT || '3000', 10);
+const PORT = parseInt(process.env.PORT || '80', 10);
 
 // Trust Coolify/Traefik reverse proxy
 app.set('trust proxy', 1);

start.sh

@@ -179,5 +179,5 @@ async function seed() {
 seed();
 " 2>/dev/null || echo "[start] Seed warning (continuing)"
 
-echo "[start] Starting Node.js backend on port 3000..."
+echo "[start] Starting Node.js backend on port ${PORT:-80}..."
 exec node dist/index.js