Multi-site & shared APIs

Site prefixes

Prefix	Brand	Notes
`fn`	Fox News	Largest route surface (mobile, CMS, RSS)
`fb`	Fox Business	Business mobile + content
`fw`	Fox Weather	Heavy `mobile.spark.tab` usage
`ok`	Outkick
`fs`	Fox Sports

First URL segment selects identity; remaining path matches routes for that site (or shared rules where configured).

Map to src/apis/shared/... handlers.
Use for Spark content, Brightcove, Delta, search, liveblogs, sitemap, swagger, and other cross-brand capabilities.
Keeps one implementation instead of duplicating per foxnews, foxbusiness, etc., when behavior is truly identical.

Different partner contracts (RSS field requirements).
Different upstream URLs or auth per brand.
Product-specific orchestration (e.g. Fox News mobile home vs Fox Weather Spark layout).

Fork into src/apis/{site}/ and adjust only the differing layers — still reuse shared helpers where possible.

Shared route: ensure apis/shared/... path matches group + route key conventions.
Site route: ensure apis/{site}/... mirrors the same pattern.

For shared endpoints, smoke test at least two site prefixes if both expose the same path pattern:

/fn/articles/123
/fb/articles/123

Use ?debugga=setup:identity to confirm site resolution.