Update/add frontend pages for categories, brands, vendors new routes, update products page to use new route

inventory-server/src/routes/brandsAggregate.js

@@ -192,7 +192,28 @@ router.get('/', async (req, res) => {
         ]);
 
         const total = parseInt(countResult.rows[0].total, 10);
-        const brands = dataResult.rows;
+        const brands = dataResult.rows.map(row => {
+            // Create a new object with both snake_case and camelCase keys
+            const transformedRow = { ...row }; // Start with original data
+            
+            for (const key in row) {
+                // Skip null/undefined values
+                if (row[key] === null || row[key] === undefined) {
+                    continue; // Original already has the null value
+                }
+
+                // Transform keys to match frontend expectations (add camelCase versions)
+                // First handle cases like sales_7d -> sales7d
+                let camelKey = key.replace(/_(\d+[a-z])/g, '$1');
+                
+                // Then handle regular snake_case -> camelCase
+                camelKey = camelKey.replace(/_([a-z])/g, (_, letter) => letter.toUpperCase());
+                if (camelKey !== key) { // Only add if different from original
+                    transformedRow[camelKey] = row[key];
+                }
+            }
+            return transformedRow;
+        });
 
         // --- Respond ---
         res.json({