Fix /stats route: make async and correct trending mints response

- Make /stats route handler async
- Await getTrendingMints call
- Fix trending mints response to use view_count instead of views_7d

src/routes/system.js

@@ -59,7 +59,7 @@ router.get('/health', (req, res) => {
  * GET /stats
  * System statistics
  */
-router.get('/stats', (req, res) => {
+router.get('/stats', async(req, res) => {
     try {
         // Mint counts by status
         const mintCounts = countMintsByStatus();
@@ -102,7 +102,7 @@ router.get('/stats', (req, res) => {
         const recentReviews = getRecentReviews(5);
 
         // Trending mints
-        const trending = getTrendingMints(5);
+        const trending = await getTrendingMints(5);
 
         res.json({
             mints: {
@@ -121,7 +121,7 @@ router.get('/stats', (req, res) => {
             trending_mints: trending.map(m => ({
                 mint_id: m.mint_id,
                 name: m.name,
-                views_7d: m.views_7d
+                views_7d: m.view_count
             })),
             computed_at: nowISO()
         });