feat(api): Hono backend skeleton with /health endpoint and test

apps/api/vitest.config.ts

@@ -0,0 +1,9 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    environment: 'node',
+    setupFiles: ['./test/setup.ts'],
+    fileParallelism: false,
+  },
+});