feature: implement akatsuki CI/CD deployment workflow and documentation

[shunsock]

Summary

Implements Issue #143 (manual deployment workflow) and Issue #144 (documentation updates) for the akatsuki Docker containers project.

Changes

1. Deploy Workflow (.github/workflows/akatsuki-deploy.yml)

• Trigger: Manual execution via workflow_dispatch from GitHub Actions tab
• Version Management: Automatically extracts VERSION from akatsuki/Taskfile.yml
• Images Deployed:
  • tsuchiya55docker/akatsuki:default-arm-{version} + default-arm-latest
  • tsuchiya55docker/akatsuki:default-amd-{version} + default-amd-latest
  • tsuchiya55docker/akatsuki:python-{version} + python-latest
• Build Strategy: Parallel builds with fail-fast: true (ensures all-or-nothing deployment)
• Authentication: Uses GitHub Secrets (DOCKER_USERNAME, DOCKER_PASSWORD)

2. CLAUDE.md Updates

• Added CI/CD section to Akatsuki commands
• Documents PR builds (automatic validation)
• Documents manual deployment workflow
• References version management and registry

3. akatsuki/README.md Complete Rewrite

• CI/CD Documentation:
  • GitHub Actions status badges
  • Detailed workflow descriptions
  • Step-by-step deployment process
  • Docker Hub authentication setup guide
  • Version management explanation
• Local Development: Build, run, and push commands
• Architecture: Multi-stage builds, base images, components
• Contributing: Version bump process and testing requirements

Test Plan

• Workflow YAML syntax validated
• VERSION extraction tested locally: grep '^ VERSION:' akatsuki/Taskfile.yml | awk '{print $2}'
• Documentation reviewed for accuracy
• PR build workflow validates image builds (automatic on PR creation)
• Manual deployment workflow test (after merge):
  1. Navigate to Actions tab
  2. Run "Akatsuki Docker Deploy" workflow
  3. Verify 6 tags pushed to Docker Hub (3 images × 2 tags each)
  4. Pull and test images: docker pull tsuchiya55docker/akatsuki:default-arm-0.0.2

Related Issues

• Closes 手動デプロイワークフロー実装 #143 (Manual deployment workflow)
• Closes akatsuki CI/CD ドキュメント更新 #144 (Documentation updates)
• Related to [Epic] akatsukiのGitHub Actions自動デプロイ実装 #141 (Epic: akatsuki CI/CD automation)
• Depends on Docker Hub認証設定 #145 (Docker Hub authentication - already configured)

Notes

• Docker Hub authentication secrets are already configured and ready for deployment
• The deploy workflow can be tested immediately after merge
• PR build workflow (PRビルドワークフロー実装 #142) will validate the images before merge

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