refactor backend and persist stock campaign queue

backend/routes/internalRoutes.js

@@ -0,0 +1,17 @@
+const express = require('express');
+const { authenticateAPIKey } = require('../auth');
+const { processPendingStockCampaigns } = require('../services/campaignService');
+
+const router = express.Router();
+
+router.post('/process-stock-campaigns', authenticateAPIKey, async (req, res) => {
+    try {
+        const summary = await processPendingStockCampaigns();
+        res.json(summary);
+    } catch (error) {
+        console.error('Error processing stock campaigns:', error);
+        res.status(500).json({ error: 'Internal Server Error' });
+    }
+});
+
+module.exports = router;