feat(server): extract question httpapi contract

packages/server/src/definition/api.ts

@@ -1,6 +1,12 @@
-import type { ServerApi } from "../types.js"
+import { HttpApi, OpenApi } from "effect/unstable/httpapi"
+import { questionApi } from "./question.js"
 
-export const api: ServerApi = {
-  name: "opencode",
-  groups: [],
-}
+export const api = HttpApi.make("opencode")
+  .addHttpApi(questionApi)
+  .annotateMerge(
+    OpenApi.annotations({
+      title: "opencode experimental HttpApi",
+      version: "0.0.1",
+      description: "Experimental HttpApi surface for selected instance routes.",
+    }),
+  )