Add Endpoints and MiddlewareChain iterators on API server, bridge
ResponseFieldsSeq/HeadersSeq. Use strings.SplitSeq in SDK codegen,
slices.SortFunc in OpenAPI spec generation.
Co-Authored-By: Gemini <noreply@google.com>
Co-Authored-By: Virgil <virgil@lethean.io>
Add SSEBroker type that manages SSE client connections and broadcasts
events to subscribed clients. Clients connect via GET /events and
optionally filter by channel with ?channel=<name>. Includes Publish,
ClientCount, and Drain methods for event broadcasting and lifecycle
management.
Co-Authored-By: Virgil <virgil@lethean.io>
