Maintenance

[digizeph]

This PR updates dependencies, improves error handling, and adds CI infrastructure.

Key Changes:

Dependencies & Tooling:

• Updated reqwest to 0.12, clap to 4.5.46 with derive support
• Added GitHub Actions CI workflow for multi-platform builds and testing

Error Handling:

• Fixed HTTP error handling in query_host and retrieve_ip - now checks response status before processing instead of panicking on non-200 responses
• Replaced deprecated chrono ymd() API with from_ymd_opt() for proper error handling
• Enhanced date parsing fallback logic in Index sorting

Code Quality:

• Migrated from clap::Clap to clap::Parser
• Updated CLI argument definitions and interactive prompts
• Fixed documentation examples with proper imports
• Applied consistent formatting throughout codebase

This should address #3 and #4.