Document collection delete rescans and media-item path drift for the next release

[Copilot]

This drift report identified one user-visible collections behavior change and one public media-server contract change that were not yet reflected in the Next docs. This PR documents the post-delete rescan flow and the new optional path field surfaced by single-item media metadata reads.

• Collections

  • Document that file-deleting Radarr, Sonarr, and Sportarr actions now ask the media server to rescan the affected folder after the delete.
  • Clarify that this rescan uses the media server's own path namespace, so it does not depend on the leftover-folder-cleanup bind mount or path mapping.

• Media Server API

  • Document the optional path field on GET /api/media-server/meta/{id}.
  • Clarify the field's semantics:
    • movies and episodes return the media file path
    • shows and seasons return the folder path
    • Plex seasons do not provide a path
  • Note that paged/search/recent/children routes do not guarantee path.

• Bundled OpenAPI snapshot

  • Update static/openapi-spec/maintainerr_api_specs.yaml to reflect the path field on the single-item metadata route.

• Already covered by prior PRs

  • The pending collection membership reconciliation drift from the issue was already documented on main, so it is intentionally not duplicated here.

{
  "id": "12345",
  "title": "An example title",
  "type": "movie",
  "path": "/media/movies/An example title (2026)/An example title (2026).mkv",
  "library": { "id": "1", "title": "Movies" }
}

• Fixes Docs drift - updates needed for the next Maintainerr release #173