feat: custom OpenAI-compatible endpoint as a first-class provider (vision + context from /models)

src/server/index.ts

@@ -45,3 +45,7 @@ export * from "./observability.ts";
 export * from "./model-catalog.ts";
 export { subscriptionControlsResponse, subscriptionBrowserResponse } from "./web-subscription-http.ts";
 export { sessionCost } from "./pricing.ts";
+// The custom OpenAI-compatible endpoint (custom-endpoint wave): the deep
+// module that registers the user's endpoint into piModels() and probes it for
+// models. Importing it has no side effects; the boot sync lives in stores.ts.
+export * from "./custom-provider.ts";