fix: update nginx for proper Next.js deep linking support

- Prioritize .html in try_files to correctly resolve static export routes

nginx.conf

@@ -41,9 +41,9 @@ http {
             add_header Cache-Control "public, immutable";
         }
 
-        # SPA fallback
+        # SPA fallback for Next.js static export
         location / {
-            try_files $uri $uri/ /index.html;
+            try_files $uri $uri.html $uri/ /index.html;
         }
 
         # Health check endpoint