feat: add Nginx reverse proxy and SSL configuration

- Introduce Nginx service in docker-compose for handling HTTP/HTTPS traffic.
- Configure Nginx with SSL support and health checks for Grafana and Prometheus.
- Update env.template to include SERVER_IP and STATUS_PAGE_PASSWORD variables.
- Enhance Ansible playbook with tasks for Nginx installation, SSL certificate generation, and configuration management.

infra/nginx/conf.d/status.conf

@@ -0,0 +1,24 @@
+# Status page configuration (for future uptime kuma integration)
+
+# Rate limiting for status page
+location /status {
+    # Basic authentication for status page
+    auth_basic "Status Page Access";
+    auth_basic_user_file /etc/nginx/.htpasswd;
+    
+    # Placeholder for future uptime kuma integration
+    # For now, show nginx status
+    access_log off;
+    return 200 '{"status": "ok", "nginx": "running", "timestamp": "$time_iso8601"}';
+    add_header Content-Type application/json;
+}
+
+# Nginx status stub (for monitoring)
+location /nginx_status {
+    stub_status on;
+    access_log off;
+    allow 127.0.0.1;
+    allow 172.16.0.0/12;  # Docker networks
+    allow 192.168.0.0/16; # Private networks
+    deny all;
+}