feat: migrate from static config to database and add authentication

- Replaced static hosts.json and staticConfig.ts with SQLite database (Prisma)

- Implemented JWT authentication and Login UI

- Added dynamic API routes for hosts, topology, and settings

- Updated UI components to fetch and manage state dynamically

- Added Settings interface for managing hosts and topology nodes

server/middleware/auth.ts

@@ -0,0 +1,27 @@
+import { Request, Response, NextFunction } from 'express';
+import jwt from 'jsonwebtoken';
+
+export interface AuthRequest extends Request {
+    user?: {
+        id: string;
+        username: string;
+    };
+}
+
+const JWT_SECRET = process.env.JWT_SECRET || 'fallback-secret-for-development-only';
+
+export const requireAuth = (req: AuthRequest, res: Response, next: NextFunction) => {
+    const authHeader = req.headers.authorization;
+    if (!authHeader?.startsWith('Bearer ')) {
+        return res.status(401).json({ status: 'error', message: 'Authentication required' });
+    }
+
+    const token = authHeader.split(' ')[1];
+    try {
+        const decoded = jwt.verify(token, JWT_SECRET) as { id: string; username: string };
+        req.user = decoded;
+        next();
+    } catch (error) {
+        return res.status(401).json({ status: 'error', message: 'Invalid or expired token' });
+    }
+};