Move Docker configuration to tools/build/docker/

[Thinkersbluff]

Consolidate Docker-related files into organized tools structure.

Tasks:

• Move get-docker.sh → tools/build/docker/get-docker.sh
• Move docker-compose.yml → tools/build/docker/docker-compose.yml
• Move docker/Dockerfile → tools/build/docker/Dockerfile
• Move .env → tools/build/docker/.env
• Remove empty docker/ directory

Acceptance Criteria:

• All Docker files in tools/build/docker/
• Docker Compose functionality preserved
• Old directory removed

Dependencies: Create tools/ directory structure
Estimate: 2 story points

[Thinkersbluff]

Apologies - this issue was created accidentally during testing of repository automation scripts. This issue has been removed as it was not intended for this repository.