refactor: replace server action with API route for image uploads and update Nginx rate limiting configuration

nginx.conf

@@ -15,9 +15,19 @@ http {
     server {
         listen 80;
         
+        # Bypass rate limit for static assets and Next.js internal files
+        location /_next/ {
+            proxy_pass http://erika:3000;
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+            proxy_set_header Connection "upgrade";
+            proxy_set_header Host $host;
+        }
+
+        # Apply rate limit to actual page loads and API requests
         location / {
-            # Apply rate limit: allow burst of up to 10 requests without delay
-            limit_req zone=ratelimit burst=10 nodelay;
+            # Increased burst to 30 to allow normal page loads that fetch multiple APIs/images
+            limit_req zone=ratelimit burst=30 nodelay;
             
             # Proxy to the Next.js app
             proxy_pass http://erika:3000;