fix(feishu): keep setup entry off runtime SDK (#70339)

Load Feishu setup surfaces through a setup-only barrel so onboarding does not import the Lark SDK before bundled runtime deps are staged.\n\nThanks @andrejtr.\n\nCo-authored-by: andrejtr <64274971+andrejtr@users.noreply.github.com>

extensions/feishu/setup-entry.test.ts

@@ -0,0 +1,14 @@
+import { describe, expect, it, vi } from "vitest";
+
+vi.mock("@larksuiteoapi/node-sdk", () => {
+  throw new Error("setup entry must not load the Feishu SDK");
+});
+
+describe("feishu setup entry", () => {
+  it("loads the setup plugin without importing Feishu runtime dependencies", async () => {
+    const { default: setupEntry } = await import("./setup-entry.js");
+
+    expect(setupEntry.kind).toBe("bundled-channel-setup-entry");
+    expect(setupEntry.loadSetupPlugin({ installRuntimeDeps: false })?.id).toBe("feishu");
+  });
+});