Replace the flat `remotes:` map (with `type: "remote"/"virtual"/"local"`) with
separate top-level sections — `remote:`, `virtual:`, `local:` — so the repo
type is declared structurally and the `type:` field is no longer needed.
Config loader normalises the new format to the existing internal representation
(injecting `type` into each remote dict), so all handler code is unchanged.
Adds a TestYamlTypeKeys suite covering all three type keys, mixed files, and
field preservation. Includes README migration guide for splitting a single
remotes file into per-type-and-package conf.d files.
examples/single-file/remotes.yaml — original monolithic config
examples/conf.d-method/ — one yaml per remote (alpine, github, pypi)
docker-compose updated to mount from examples/single-file/.
unkinben