Move all hard-coded identity server settings (API resource, scope, client,
users/roles) from Program.cs into config/idp-config.json and add parsing
logic. The config file is copied to the output directory so it works for
local development and is available at /app/config/idp-config.json in the
Docker image, making it straightforward to override via a volume mount.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Marek Lesko