fix(bff): agregar endpoint /settings/demo-mode y proxy /api/v1 en Express Node.js y Flask API

frontend/src/app.js

@@ -229,6 +229,31 @@ const buildingsRoutes = require('./routes/buildings');
 const adminRoutes = require('./routes/admin');
 const mySubjectsRoutes = require('./routes/my_subjects');
 
+// Proxy transparente hacia la API REST de Flask para llamadas AJAX frontend
+app.use('/api/v1', async (req, res) => {
+    try {
+        const token = req.cookies.auth_token;
+        const targetUrl = `${process.env.FLASK_API_URL || 'http://localhost:5000/api/v1'}${req.url}`;
+        const headers = { ...req.headers };
+        delete headers.host;
+        if (token && !headers.authorization) {
+            headers.authorization = `Bearer ${token}`;
+        }
+        const resp = await axios({
+            method: req.method,
+            url: targetUrl,
+            data: req.body,
+            params: req.query,
+            headers,
+            validateStatus: () => true
+        });
+        return res.status(resp.status).json(resp.data);
+    } catch (err) {
+        console.error('API v1 proxy error:', err.message);
+        return res.status(500).json({ error: 'ProxyError', message: 'Error de comunicación con el backend API: ' + err.message });
+    }
+});
+
 app.use('/', indexRoutes);
 app.use('/auth', authRoutes);
 app.use('/dashboard', dashboardRoutes);