feat: Add billing routes in server.js for retrieving and updating billing data, and integrate BillingManager in App.jsx for navigation

backend/server.js

@@ -295,6 +295,75 @@ app.post('/api/servers', async (req, res) => {
     }
 });
 
+// --- Billing Routes ---
+
+// Get billing data from S3
+app.get('/api/billing', async (req, res) => {
+    const params = {
+        Bucket: BUCKET_NAME,
+        Key: 'servers-billing.json',
+    };
+
+    try {
+        const data = await s3.getObject(params).promise();
+        const fileContent = data.Body.toString('utf-8');
+        let billingData = [];
+        
+        try {
+            billingData = JSON.parse(fileContent);
+            // Ensure it's an array
+            if (!Array.isArray(billingData)) {
+                billingData = [];
+            }
+        } catch (parseError) {
+            console.error('Error parsing servers-billing.json:', parseError);
+            billingData = [];
+        }
+        
+        res.json(billingData);
+    } catch (error) {
+        if (error.code === 'NoSuchKey') {
+            res.json([]); // Return empty array if file does not exist
+        } else {
+            console.error(error);
+            res.status(500).send('Error reading from S3');
+        }
+    }
+});
+
+// Update billing data in S3
+app.post('/api/billing', async (req, res) => {
+    const { domains: billingData } = req.body; // Keep name 'domains' for consistency
+    
+    // Validate billing data structure
+    if (!Array.isArray(billingData)) {
+        return res.status(400).send('Billing data must be an array');
+    }
+    
+    // Validate each billing item has required fields
+    for (let i = 0; i < billingData.length; i++) {
+        const item = billingData[i];
+        if (!item.hostName || !item.nodeName || !item.country || !item.provider) {
+            return res.status(400).send(`Billing item at index ${i} is missing required fields`);
+        }
+    }
+
+    const params = {
+        Bucket: BUCKET_NAME,
+        Key: 'servers-billing.json',
+        Body: JSON.stringify(billingData, null, 2), // Pretty print JSON
+        ContentType: 'application/json',
+    };
+
+    try {
+        await s3.putObject(params).promise();
+        res.send('File updated successfully');
+    } catch (error) {
+        console.error(error);
+        res.status(500).send('Error writing to S3');
+    }
+});
+
 // --- Filters Routes (JSON format) ---
 
 // Get filters from S3