refactor: modularize registry command structure

[aroff]

Summary

• Refactor monolithic registry.rs into organized submodules for better maintainability and code organization
• Add GitHub Actions workflow for automatic deployment on merge
• Add comprehensive test runner script for local development

Changes

Registry Refactoring

Split the large registry.rs file (1,307 lines) into focused submodules:

• formatters.rs: Display and output formatting utilities
• helpers.rs: Common utilities and configuration management
• marketplace.rs: Marketplace browsing and discovery functionality
• repo_ops.rs: Repository management operations (add, remove, list, etc.)
• skill_ops.rs: Skill-related operations (search, info, versions, etc.)
• mod.rs: Main command structure and routing

This improves code maintainability, reduces file size, and makes the codebase easier to navigate.

CI/CD Improvements

• Add .github/workflows/auto-deploy-on-merge.yml for automated deployments
• Add scripts/run-tests.sh for comprehensive local test execution

Other Changes

• Remove unused repo_type_to_string helper function
• Update .gitignore patterns
• Update dependencies in Cargo.lock

Test Plan

• All unit tests pass (85 tests)
• All integration tests pass
• Clippy checks pass with no warnings
• Code formatting verified
• Documentation builds successfully
• Pre-commit and pre-push hooks pass

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