Crewcal

Added
- Extract contact information for hotels into vCard files (.vcf) using `crewcal hotels`.

Added
- Hotel information

Changed
- Upgrade LLM to GPT 4o mini

Added
- Show actual cost - as calculated by langchain - after call. Note: does not seem to work for gpt-4o.

Changed
- Catch error and show warning in log when command is run without OPENAI_API_KEY being set.

Fixed
- +1 for next date now no longer causing json issues. Stopped working with the same OpenAI model after previous fix.

Fixed
- Arrivals on next day are correctly reflected again. Stopped working with the same OpenAI model.

Changed
- Adding extract completed message using Halo (spinner)

Fixed
- Error with reading and saving files.