docs: [#248] add comprehensive security documentation and analysis

- Add ADR: Docker/UFW firewall security strategy with layered approach
- Add Security Analysis section to ADR (threat model, compliance, monitoring, recovery)
- Add Research Findings section with Docker official documentation references
- Create Docker network segmentation analysis document
- Update issue specification Phase 1 (completed) and Phase 2 (in progress)
- Add security terms to project dictionary (distroless, HIDS, OSSEC, Wazuh)

Phase 1 (Research and Analysis) is now complete with comprehensive
documentation of Docker's iptables manipulation, UFW incompatibility,
alternative solutions evaluation, and security best practices.

The ADR now includes:
- 5 attack vectors with risk assessment and mitigation strategies
- Compliance framework analysis (OWASP, CIS, PCI-DSS, SOC 2, HIPAA, GDPR)
- 6 monitoring/detection mechanisms with example scripts
- 6-step incident response and remediation workflow

Network segmentation analysis provides detailed evaluation of 3 options
with security context about Tracker credentials and Prometheus authentication,
recommending three-network segmentation for maximum isolation.

Related: #248

Author: josecelano