Deployment improvements

[MyDrift-user]

Type of Change

• New feature
• Documentation update
• Refactoring

Description

Refactor utils into mw_utils package and improve app setup

• Split the monolithic utils.py into a modular mw_utils package with dedicated modules for environment, config, parameter encoding, authentication, HTTP client, and handler creation.
• Updated app.py to use the new utilities, added logging configuration, improved CORS setup, and introduced request ID and health check endpoints.
• Replaced .env.example with a more detailed .env.template.

Improve MOODLE_URL handling and handler creation

• Introduces _get_env_moodle_url to treat empty or '*' MOODLE_URL as unset, requiring moodle_url query param.
• Adds docstrings for clarity, refines handler logic to use normalized base URL, and updates handler signature construction to reflect new environment variable handling.

Revise and clarify README documentation

• Streamlined feature list
• Updated Docker and manual run instructions
• Clarified authentication and usage steps
• Improved configuration documentation.
• Enhanced environment variable explanations and provided clearer examples for API usage.
• Added Credits

Testing

• tested, works

Checklist

• My code adheres to the coding and style guidelines of the project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no errors/warnings/merge conflicts.