feat: add bash cybersecurity audit and hardening functions

12 funciones Bash del dominio cybersecurity: auditoria de red y servicios
(analyze_dns, audit_http_headers, inspect_ssl_cert, list_active_connections,
enumerate_subdomains, geolocate_ip), auditoria de sistema (audit_ssh_config,
check_firewall, detect_suspicious_users), y utilidades crypto (encrypt_file,
generate_password, verify_file_hash). Dominio nuevo en bash/functions/.

bash/functions/cybersecurity/analyze_dns.md

@@ -0,0 +1,52 @@
+---
+name: analyze_dns
+kind: function
+lang: bash
+domain: cybersecurity
+version: "1.0.0"
+purity: impure
+signature: "analyze_dns(domain: string, mode: string) -> void"
+description: "Análisis DNS completo de un dominio: registros A/AAAA/MX/NS/TXT/CNAME/SOA, consulta whois y verificación contra listas negras DNSBL (spamhaus, spamcop, sorbs, barracuda)."
+tags: [bash, cybersecurity, dns, network, whois, dnsbl, reconnaissance]
+uses_functions: []
+uses_types: []
+returns: []
+returns_optional: false
+error_type: "error_go_core"
+imports: []
+params:
+  - name: domain
+    desc: "dominio a analizar, ej: example.com"
+  - name: mode
+    desc: "modo de análisis: records (solo registros DNS), whois (solo whois), dnsbl (solo listas negras) o all (todo, por defecto)"
+output: "imprime registros DNS, información whois y estado DNSBL a stdout con colores ANSI"
+tested: false
+tests: []
+test_file_path: ""
+file_path: "bash/functions/cybersecurity/analyze_dns.sh"
+source_repo: "https://gitea-dgg044oo04woo4ggcsws4gk0.organic-machine.com/egutierrez/DevLauncher.git"
+source_license: "MIT"
+source_file: "scripts/linux/ciberseguridad/redes/analisis_dns.sh"
+---
+
+## Ejemplo
+
+```bash
+source bash/functions/cybersecurity/analyze_dns.sh
+
+# Análisis completo
+analyze_dns example.com
+
+# Solo registros DNS
+analyze_dns example.com records
+
+# Solo whois
+analyze_dns example.com whois
+
+# Solo DNSBL
+analyze_dns example.com dnsbl
+```
+
+## Notas
+
+Requiere `dig` (paquete dnsutils). `whois` es opcional — si no está instalado y el modo es `all`, se omite el paso whois con aviso. Las listas negras DNSBL se consultan via DNS inverso (técnica estándar sin HTTP). El modo `dnsbl` resuelve primero la IP del dominio y luego construye la consulta invertida para cada blacklist.