Initiële commit: VibeFinance 3-container opzet

Basislijn van de bestaande applicatie (Vite/React frontend, Express
backend, PostgreSQL) zoals die in de index stond, plus dev-, release-
en documentatiescripts.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

backend/src/middleware/auth.js

@@ -0,0 +1,22 @@
+import jwt from "jsonwebtoken";
+import { config } from "../config/index.js";
+
+export function authenticate(req, res, next) {
+  const header = req.headers.authorization;
+  if (!header?.startsWith("Bearer ")) {
+    return res.status(401).json({ error: "Niet ingelogd." });
+  }
+  try {
+    req.user = jwt.verify(header.slice(7), config.JWT_SECRET);
+    next();
+  } catch {
+    res.status(401).json({ error: "Sessie verlopen. Log opnieuw in." });
+  }
+}
+
+export function requireAdmin(req, res, next) {
+  if (req.user?.rol !== "Admin") {
+    return res.status(403).json({ error: "Geen toegang." });
+  }
+  next();
+}