Dashboard Leads - version limpia para servidor (.env y config de despliegue restaurados)

frontend/nginx.conf

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+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Compresion
+    gzip on;
+    gzip_types text/plain text/css application/json application/javascript
+               text/xml application/xml application/xml+rss text/javascript
+               image/svg+xml;
+    gzip_min_length 1024;
+
+    # Cache larga para los assets con hash en el nombre
+    location /assets/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+        try_files $uri =404;
+    }
+
+    # SPA: cualquier ruta desconocida devuelve index.html
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # index.html nunca se cachea, para que los deploys se vean al instante
+    location = /index.html {
+        add_header Cache-Control "no-store, no-cache, must-revalidate";
+    }
+
+    error_page 500 502 503 504 /50x.html;
+    location = /50x.html {
+        root /usr/share/nginx/html;
+        internal;
+    }
+}