refactor: update nginx configuration for improved caching and clarity

frontend/nginx.conf

@@ -1,19 +1,33 @@
 server {
     listen 80;
 
-    # Przekieruj /odoo (bez slash) na /odoo/ (z slash)
+    # Przekierowanie bez / na /odoo/
     location = /odoo {
         return 301 /odoo/;
     }
 
-    # Serwowanie plików Vue pod /odoo/
+    # Serwowanie Vue
     location /odoo/ {
         alias /usr/share/nginx/html/;
         index index.html;
         try_files $uri $uri/ /odoo/index.html;
     }
 
-    # Proxy do backendu (niewidoczny z zewnątrz)
+    # no cache index.html
+    location = /odoo/index.html {
+        add_header Cache-Control "no-cache, no-store, must-revalidate";
+        expires 0;
+    }
+
+    # cache JS/CSS/OBRAZY na długo
+    location ~* \.(?:js|css|png|jpg|jpeg|gif|ico|svg|woff2?)$ {
+        add_header Cache-Control "public, max-age=31536000, immutable";
+        access_log off;
+        expires 1y;
+        alias /usr/share/nginx/html/;
+    }
+
+    # Proxy do backendu
     location /odoo/api/ {
         proxy_pass http://backend:8000/;
         proxy_set_header Host $host;
@@ -22,3 +36,4 @@ server {
         proxy_set_header X-Forwarded-Proto $scheme;
     }
 }
+