Add reverse proxy SSL guides for Caddy, Nginx, and Traefik.

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/nginx/snippets/proxy_params.conf

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+proxy_http_version 1.1;
+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;
+proxy_set_header X-Forwarded-Host  $host;
+proxy_set_header Connection        "";
+proxy_read_timeout  60s;
+proxy_send_timeout  60s;
+proxy_buffering on;

deploy/nginx/snippets/ssl_params.conf

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+ssl_session_cache shared:SSL:10m;
+ssl_session_timeout 1d;
+ssl_session_tickets off;
+
+ssl_protocols TLSv1.2 TLSv1.3;
+ssl_prefer_server_ciphers off;
+
+# Modern Mozilla intermediate
+ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305;
+
+add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
+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;