add ai worker

backend/ai/test/index.spec.ts

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+// test/index.spec.ts
+import { env, createExecutionContext, waitOnExecutionContext, SELF } from 'cloudflare:test';
+import { describe, it, expect } from 'vitest';
+import worker from '../src/index';
+
+// For now, you'll need to do something like this to get a correctly-typed
+// `Request` to pass to `worker.fetch()`.
+const IncomingRequest = Request<unknown, IncomingRequestCfProperties>;
+
+describe('Hello World worker', () => {
+	it('responds with Hello World! (unit style)', async () => {
+		const request = new IncomingRequest('http://example.com');
+		// Create an empty context to pass to `worker.fetch()`.
+		const ctx = createExecutionContext();
+		const response = await worker.fetch(request, env, ctx);
+		// Wait for all `Promise`s passed to `ctx.waitUntil()` to settle before running test assertions
+		await waitOnExecutionContext(ctx);
+		expect(await response.text()).toMatchInlineSnapshot(`"Hello World!"`);
+	});
+
+	it('responds with Hello World! (integration style)', async () => {
+		const response = await SELF.fetch('https://example.com');
+		expect(await response.text()).toMatchInlineSnapshot(`"Hello World!"`);
+	});
+});

backend/ai/test/tsconfig.json

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+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "types": [
+      "@cloudflare/workers-types/experimental",
+      "@cloudflare/vitest-pool-workers"
+    ]
+  },
+  "include": ["./**/*.ts", "../src/env.d.ts"],
+  "exclude": []
+}