feat(env): allow updating vars by UUID or key identifier

[andrasbacsai]

Summary

• Change env update command signature to accept <env_uuid_or_key> as a positional argument instead of requiring --key flag
• Applied to all resource types: applications, databases, and services
• Users can now identify env vars by UUID (preferred) or key name when updating
• Make --key optional, only used for renaming variables
• Make --value explicitly required
• Update documentation in README.md and llms.txt

Breaking Changes

The coolify app/database/service env update commands have changed their interface:

Before:

coolify app env update <app_uuid> --key <key_name> --value <new_value>

After:

coolify app env update <app_uuid> <env_uuid_or_key> --value <new_value>

• The env identifier (UUID or key name) is now a required positional argument
• The --key flag is now optional and only used when renaming the variable
• The --value flag is now explicitly marked as required

Same changes apply to:

• coolify database env update
• coolify service env update

Context

Fixes #62 where users couldn't update environment variables using the UUID returned by coolify app env get. The new interface supports both UUID (recommended) and key identifiers, making it more intuitive and compatible with scripting workflows.

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Fixes #62