feat: add phase 1 runnable skeleton

apps/companion/src/routes/health.ts

@@ -0,0 +1,21 @@
+import type { FastifyInstance } from 'fastify';
+import { healthResponseSchema } from '@hermes-mobile/shared';
+import { getHermesHealth } from '../system/hermesHealth.js';
+
+export async function registerHealthRoutes(app: FastifyInstance): Promise<void> {
+  app.get('/api/health', async () => {
+    const response = {
+      ok: true,
+      service: 'hermes-mobile-companion' as const,
+      version: process.env.npm_package_version ?? '0.1.0',
+      mode: process.env.NODE_ENV === 'production' || process.env.NODE_ENV === 'test' ? process.env.NODE_ENV : 'development',
+      uptimeSeconds: process.uptime(),
+      timestamp: new Date().toISOString(),
+      checks: {
+        hermes: await getHermesHealth(),
+      },
+    };
+
+    return healthResponseSchema.parse(response);
+  });
+}