feat(editor): complete the apis block and drop the removed snippets

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

packages/language-server/test/apis-completion.test.ts

@@ -0,0 +1,6 @@
+import { expect, test } from "bun:test";
+import { WRN_KEYWORDS } from "../src/index.ts";
+
+test("apis is a known page-level keyword", () => {
+  expect(WRN_KEYWORDS).toContain("apis");
+});