Add nginx configuration for Hub deployment

Includes:
- HTTP to HTTPS redirect
- Placeholder SSL certs for initial nginx -t pass
- Proxy to Hub API on port 8200
- ACME challenge location for certbot
- WebSocket support headers
- Usage instructions in comments

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

hub.nginx.conf

@@ -0,0 +1,59 @@
+# Nginx configuration for LetsBe Hub
+# Usage:
+#   1. Copy to /etc/nginx/sites-available/hub.letsbe.biz
+#   2. Create symlink: ln -s /etc/nginx/sites-available/hub.letsbe.biz /etc/nginx/sites-enabled/
+#   3. Create placeholder certs (for initial nginx -t):
+#      openssl req -x509 -nodes -days 365 -newkey rsa:2048 \
+#        -keyout /etc/nginx/placeholder.key -out /etc/nginx/placeholder.crt \
+#        -subj "/CN=placeholder"
+#   4. Test: nginx -t
+#   5. Reload: systemctl reload nginx
+#   6. Get real certs: certbot --nginx -d hub.letsbe.biz
+
+server {
+    listen 80;
+    server_name hub.letsbe.biz;
+
+    location / {
+        return 301 https://$host$request_uri;
+    }
+
+    location ^~ /.well-known/acme-challenge/ {
+        alias /var/www/html/.well-known/acme-challenge/;
+        default_type "text/plain";
+        allow all;
+    }
+}
+
+server {
+    listen 443 ssl http2;
+    server_name hub.letsbe.biz;
+
+    # Placeholder certs - certbot will replace these
+    ssl_certificate /etc/nginx/placeholder.crt;
+    ssl_certificate_key /etc/nginx/placeholder.key;
+
+    # SSL settings (certbot will add its own)
+    ssl_protocols TLSv1.2 TLSv1.3;
+    ssl_prefer_server_ciphers off;
+
+    location / {
+        proxy_pass http://127.0.0.1:8200;
+        proxy_redirect off;
+        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;
+
+        # WebSocket support (if needed later)
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+    }
+
+    location ^~ /.well-known/acme-challenge/ {
+        alias /var/www/html/.well-known/acme-challenge/;
+        default_type "text/plain";
+        allow all;
+    }
+}