Configuration docs reference env vars that don't exist in code

[jtdub]

Problem

docs/getting-started/configuration.md describes environment variables like CORS_ORIGINS, LOG_LEVEL, WORKERS, and other settings for configuring the application. However, the code does not read any environment variables — CORS origins, host, port, and all other settings are hardcoded in main.py.

This misleads users into thinking they can configure the app via environment variables when they actually cannot.

Suggested Fix

Either:

• Implement environment variable support using pydantic-settings (which is already a dependency), or
• Update the configuration docs to reflect the actual state of the code.