feat: initial project scaffold

- React 19 + Vite + TailwindCSS frontend
- Express + TypeScript backend API
- PostgreSQL schema and migrations
- Docker Compose orchestration
- Drone CI/CD pipeline
- Pages: Dashboard, Servers, Containers, Services, Logs, Metrics, Settings

backend/src/middleware/errorHandler.ts

@@ -0,0 +1,18 @@
+import { Request, Response, NextFunction } from 'express';
+
+export const errorHandler = (
+  err: Error,
+  req: Request,
+  res: Response,
+  next: NextFunction
+) => {
+  console.error('Error:', err);
+
+  const statusCode = res.statusCode !== 200 ? res.statusCode : 500;
+  
+  res.status(statusCode).json({
+    error: err.message,
+    stack: process.env.NODE_ENV === 'production' ? '🥞' : err.stack,
+    timestamp: new Date().toISOString()
+  });
+};