refactor(protocol): extract server contracts (#33708)

packages/protocol/src/groups/model.ts

@@ -0,0 +1,29 @@
+import { Model } from "@opencode-ai/schema/model"
+import { Location } from "@opencode-ai/schema/location"
+import { Schema } from "effect"
+import { HttpApiEndpoint, HttpApiGroup, OpenApi } from "effect/unstable/httpapi"
+import { ServiceUnavailableError } from "../errors"
+import { LocationQuery, locationQueryOpenApi } from "./location"
+
+export const ModelGroup = HttpApiGroup.make("server.model")
+  .add(
+    HttpApiEndpoint.get("model.list", "/api/model", {
+      query: LocationQuery,
+      success: Location.response(Schema.Array(Model.Info)),
+      error: ServiceUnavailableError,
+    })
+      .annotateMerge(locationQueryOpenApi)
+      .annotateMerge(
+        OpenApi.annotations({
+          identifier: "v2.model.list",
+          summary: "List models",
+          description: "Retrieve available models ordered by release date.",
+        }),
+      ),
+  )
+  .annotateMerge(
+    OpenApi.annotations({
+      title: "models",
+      description: "Experimental model routes.",
+    }),
+  )