feat(docker): Add Docker support for all services

- Create Dockerfiles for all four services (auth, identity, authz, audit)
  - Multi-stage builds using golang:1.25-alpine
  - Minimal runtime images using alpine:latest
  - Copy config files to runtime image

- Create docker-compose.dev.yml for development
  - Only PostgreSQL and Consul
  - Use when running services locally with 'go run'

- Update docker-compose.yml for full deployment
  - All services + infrastructure
  - Services build from Dockerfiles
  - Health checks and dependencies configured
  - Environment variables for service configuration

- Add .dockerignore to optimize build context
  - Excludes docs, tests, IDE files, build artifacts

- Update SUMMARY.md
  - Document both docker-compose files
  - Add Docker deployment section
  - Update file structure to include Dockerfiles

.dockerignore

@@ -1,14 +1,64 @@
-# Docker ignore file for MkDocs build
-site/
-.mkdocs_cache/
-__pycache__/
-*.pyc
-*.pyo
-*.pyd
-.Python
-venv/
-env/
-ENV/
-.git/
+# Git files
+.git
 .gitignore
+.gitattributes
 
+# Documentation
+docs/
+*.md
+!README.md
+
+# Development files
+.envrc
+shell.nix
+.direnv/
+
+# Build artifacts
+bin/
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+*.test
+*.out
+auth-service
+identity-service
+authz-service
+audit-service
+platform
+api-gateway
+
+# Test files
+*_test.go
+test/
+*.test
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# Logs
+*.log
+
+# Temporary files
+tmp/
+temp/
+*.tmp
+
+# Docker files (don't copy into Docker)
+docker-compose*.yml
+Dockerfile*
+
+# CI/CD
+.github/
+.gitlab-ci.yml
+.circleci/
+
+# Coverage
+coverage.out
+coverage.html