add campaign observability page

backend/routes/campaignRoutes.js

@@ -0,0 +1,48 @@
+const express = require('express');
+const { verifyToken } = require('../auth');
+const {
+    getCampaignPreview,
+    getCampaignQueueSummary,
+    processPendingStockCampaigns,
+    retryCampaignItems
+} = require('../services/campaignService');
+
+const router = express.Router();
+
+router.get('/campaigns', verifyToken, async (req, res) => {
+    try {
+        res.json(await getCampaignQueueSummary());
+    } catch (error) {
+        console.error('Error fetching campaigns:', error);
+        res.status(500).json({ error: 'Internal Server Error' });
+    }
+});
+
+router.get('/campaigns/preview', verifyToken, async (req, res) => {
+    try {
+        res.json(await getCampaignPreview());
+    } catch (error) {
+        console.error('Error fetching campaign preview:', error);
+        res.status(500).json({ error: 'Internal Server Error' });
+    }
+});
+
+router.post('/campaigns/process', verifyToken, async (req, res) => {
+    try {
+        res.json(await processPendingStockCampaigns());
+    } catch (error) {
+        console.error('Error processing campaigns:', error);
+        res.status(500).json({ error: 'Internal Server Error' });
+    }
+});
+
+router.post('/campaigns/retry', verifyToken, async (req, res) => {
+    try {
+        res.json(await retryCampaignItems(req.body || {}));
+    } catch (error) {
+        console.error('Error retrying campaigns:', error);
+        res.status(500).json({ error: 'Internal Server Error' });
+    }
+});
+
+module.exports = router;