Refactor event HTTP API route modules (#27441)

packages/opencode/src/server/routes/instance/httpapi/groups/event.ts

@@ -0,0 +1,24 @@
+import { Schema } from "effect"
+import { HttpApi, HttpApiEndpoint, HttpApiGroup, HttpApiSchema, OpenApi } from "effect/unstable/httpapi"
+import { WorkspaceRoutingQuery } from "../middleware/workspace-routing"
+
+export const EventPaths = {
+  event: "/event",
+} as const
+
+export const EventApi = HttpApi.make("event").add(
+  HttpApiGroup.make("event")
+    .add(
+      HttpApiEndpoint.get("subscribe", EventPaths.event, {
+        query: WorkspaceRoutingQuery,
+        success: Schema.String.pipe(HttpApiSchema.asText({ contentType: "text/event-stream" })),
+      }).annotateMerge(
+        OpenApi.annotations({
+          identifier: "event.subscribe",
+          summary: "Subscribe to events",
+          description: "Get events",
+        }),
+      ),
+    )
+    .annotateMerge(OpenApi.annotations({ title: "event", description: "Instance event stream route." })),
+)