refactor: some feedback updates from coderabbit

nginx.conf

@@ -5,22 +5,45 @@ events {
 http {
     include       /etc/nginx/mime.types;
     default_type  application/octet-stream;
+    sendfile on;
+    etag on;
+    gzip on;
+    gzip_comp_level 5;
+    gzip_min_length 1024;
+    gzip_types
+        text/plain text/css application/json application/javascript
+        text/xml application/xml application/xml+rss image/svg+xml;
     
     server {
         listen 80;
-        server_name localhost;
+        server_name _;
         root /usr/share/nginx/html;
         index index.html;
+
+        add_header X-Content-Type-Options "nosniff" always;
+        add_header X-Frame-Options "DENY" always;
+        add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+        add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;
         
         # Handle client-side routing
         location / {
             try_files $uri $uri/ /index.html;
         }
+
+        location = /index.html {
+            add_header Cache-Contrl "no-store, no-cache, must-revalidate";
+            expires -1;
+        }
         
         # Cache static assets
         location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$ {
             expires 1y;
             add_header Cache-Control "public, immutable";
         }
+
+        location = healthz {
+            default_type text/plain;
+            return 200 'ok';
+        }
     }
 }