Diagnóstico y fix SQL Server: SERVERNAME, TDS_Version, Puerto explicitos

deploy/nginx-leads.conf

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+# Configuración de Nginx para Dashboard Leads (Ubuntu Server)
+
+# 1. FRONTEND: https://dashboard-leads.escueladerefrigeracion.lat
+server {
+    listen 80;
+    server_name dashboard-leads.escueladerefrigeracion.lat;
+
+    # Ruta a la carpeta dist del frontend construida con 'npm run build'
+    root /var/www/dashboard-leads/frontend/dist;
+    index index.html;
+
+    # Compresión Gzip
+    gzip on;
+    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Caché de archivos estáticos
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+        expires 30d;
+        add_header Cache-Control "public, no-transform";
+    }
+}
+
+# 2. BACKEND: http://api-leads.escueladerefrigeracion.lat
+server {
+    listen 80;
+    server_name api-leads.escueladerefrigeracion.lat;
+
+    client_max_body_size 50M;
+
+    location / {
+        proxy_pass http://127.0.0.1:8001;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+
+        # Timeouts para cargas largas si aplica
+        proxy_connect_timeout 300s;
+        proxy_send_timeout 300s;
+        proxy_read_timeout 300s;
+    }
+}