feat: initialize ingest-api with Koa and telemetry handling

- Create ingest-api with Koa framework for handling device telemetry.
- Implement telemetry ingestion with MongoDB, Redis, and PostgreSQL.
- Add API endpoints for telemetry and health checks.
- Set up testing with Vitest for unit and end-to-end tests.
- Configure Prettier and ESLint for code formatting and linting.
- Create Docker Compose setup for PostgreSQL, MongoDB, and Redis services.
- Establish contracts package for shared Zod schemas and TypeScript types.
- Implement React frontend with device status and greeting functionalities.
- Add VS Code setup documentation for onboarding developers.

apps/ingest-api/test/app.e2e-spec.ts

@@ -0,0 +1,18 @@
+import request from 'supertest';
+import { createApp } from '../src/app.js';
+import { createMemoryWriter } from '../src/stores.js';
+
+describe('ingest-api (e2e)', () => {
+  const app = createApp(createMemoryWriter());
+
+  it('POST /telemetry', async () => {
+    await request(app.callback())
+      .post('/telemetry')
+      .send({
+        deviceId: 'dev-1',
+        sentAt: new Date().toISOString(),
+        payload: { temp: 21 },
+      })
+      .expect(200);
+  });
+});