feat: Implement enterprise module bodies (DNS, Firewall, Security, SDP)

Implemented comprehensive functionality for enterprise features:

**dns_records_extended.adb** (~500 lines):
- IPv4/IPv6 address parsing and conversion
- Zone file format generation for all DNS record types
- APL record CIDR matching and creation
- Support for A, AAAA, MX, NS, CNAME, TXT, SPF, SRV, CAA, TLSA, SSHFP, APL, DS, DNSKEY records

**firewall_manager.adb** (~460 lines):
- Port rotation with time-based algorithm maintainers can calculate offline
- Service scheduling with time windows
- Firewall rule management (firewalld, iptables, nftables, pf)
- Maintenance window tracking
- Port knocking setup
- IP protocol mode control (IPv4/IPv6 toggle)
- Emergency lockdown/open operations
- Stateful/stateless rule support

**security_headers.adb** (~500 lines):
- HTTP security header generation (HSTS, CSP, X-Frame-Options, etc.)
- Server/X-Powered-By obfuscation with fake value pools
- Diagnostic mode: show real stack only to authorized IPs
- CSP nonce generation
- Web server config generation (nginx, Apache, PHP)
- HINFO record synchronization for consistent fake stacks
- All experimental headers (COEP, COOP, CORP)

**sdp_controller.adb** (~470 lines):
- Zero-trust SDP architecture (NIST SP 800-207)
- Single Packet Authorization (SPA) processing
- Authentication with MFA support
- Device posture validation
- Session management with continuous verification
- Policy evaluation and enforcement
- Micro-segmentation
- Firewall integration
- Security event logging

Total: ~1,930 lines of production code implementing enterprise security features

Author: claude