[BUG] Missing timezones when creating lodging entry

[Alchez]

🐞 Bug Description

While creating a lodging in my local timezone (Asia/Kolkata), I get the following error in the API call: "Asia/Kolkata" is not a valid choice.

🔄 Steps to Reproduce

Steps to reproduce the behavior:

1. Create a new lodging entry modal
2. In the "Date Information" section, set the timezone to "Asia/Kolkata"
3. Try to save the lodging
4. Observe the error

✅ Expected Behavior

Lodging gets created with the check-in and check-out times set in the provided timezone.

🐳 Environment Details

• Platform: Docker
• Install Method: Docker Compose
• AdventureLog Version: 0.11.0
• Reverse Proxy: None

📎 Additional Context

• This seems to be happening because timezones are being provided by two different sources:
  • In the frontend, the timezone selector uses the Intl APIs to populate the timezone values
  • In the backend, there is a hard-coded set of values accessed from the timezones.py file.
• The issue above happens because the backend expects a value of Asia/Calcutta (the old name of the city) whereas the frontend is sending Asia/Kolkata (the new name of the city).