feat: add backend analytics endpoints

backend/routes/analyticsRoutes.js

@@ -0,0 +1,43 @@
+const express = require('express');
+const { verifyToken } = require('../auth');
+const {
+    getClientAnalytics,
+    getDashboardAnalytics,
+    getProductAnalytics
+} = require('../services/analyticsService');
+
+const router = express.Router();
+
+const getRange = (query) => ({
+    start: query.start,
+    end: query.end
+});
+
+router.get('/analytics/dashboard', verifyToken, async (req, res) => {
+    try {
+        res.json(await getDashboardAnalytics(getRange(req.query)));
+    } catch (error) {
+        console.error('Error fetching dashboard analytics:', error);
+        res.status(500).json({ error: 'Internal Server Error' });
+    }
+});
+
+router.get('/analytics/products', verifyToken, async (req, res) => {
+    try {
+        res.json(await getProductAnalytics(getRange(req.query)));
+    } catch (error) {
+        console.error('Error fetching product analytics:', error);
+        res.status(500).json({ error: 'Internal Server Error' });
+    }
+});
+
+router.get('/analytics/clients', verifyToken, async (req, res) => {
+    try {
+        res.json(await getClientAnalytics(getRange(req.query)));
+    } catch (error) {
+        console.error('Error fetching client analytics:', error);
+        res.status(500).json({ error: 'Internal Server Error' });
+    }
+});
+
+module.exports = router;