Release v0.5.1

[0.5.1] - 2025-11-20

🚀 Features

• Add SQL Generation API (v0.5.1)
• Implement RETURN DISTINCT for de-duplication
• Add role-based connection pool for ClickHouse RBAC

🐛 Bug Fixes

• Eliminate flaky cache LRU eviction test with millisecond timestamps
• Replace docker_publish.yaml with docker-publish.yml
• Add missing distinct field to all Projection initializations

📚 Documentation

• Fix getting-started guide issues
• Update STATUS.md with fixed flaky test achievement (423/423 passing)
• Add /query/sql endpoint and RETURN DISTINCT documentation
• Add /query/sql endpoint and RETURN DISTINCT to wiki

🧪 Testing

• Add role-based connection pool integration tests

⚙️ Miscellaneous Tasks

• Update CHANGELOG.md [skip ci]
• Release v0.5.1
• Update CHANGELOG.md [skip ci]