Add FeedRenderer and FeedRendererProvider to support server-side
rendering of feed items via ?render=json-render query param.
- FeedRenderer maps sourceId to FeedItemRenderer, renders matching
items and drops the rest
- FeedRendererProvider mirrors FeedSourceProvider pattern for
per-user renderer construction
- UserSession exposes renderer, handler converts JrxNode to Spec
- Returns 400 for unknown render format, 500 if renderer missing
Co-authored-by: Ona <no-reply@ona.com>
Each FeedSource implementation now sets sourceId on items
it produces, allowing consumers to trace items back to
their originating source.
Co-authored-by: Ona <no-reply@ona.com>
* feat(backend): add GET /api/context endpoint
Query context values by key with exact/prefix match
support. Default mode tries exact first, falls back
to prefix.
Co-authored-by: Ona <no-reply@ona.com>
* fix(backend): validate context key element types
Reject booleans, nulls, and nested arrays in the key
param. Only string, number, and plain objects with
primitive values are accepted.
Co-authored-by: Ona <no-reply@ona.com>
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Co-authored-by: Ona <no-reply@ona.com>
