feat(host): /api/host CPU/mem/disk/net from /proc

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/api/host.test.js

@@ -0,0 +1,22 @@
+import { describe, it, expect, beforeAll } from 'vitest';
+import request from 'supertest';
+import { setup } from './helpers.js';
+
+let app, ownerHeaders;
+beforeAll(async () => { ({ app, ownerHeaders } = await setup()); });
+
+describe('host api', () => {
+  it('401 without auth', async () => {
+    expect((await request(app).get('/api/host')).status).toBe(401);
+  });
+  it('returns cpu/mem/disk/net shape', async () => {
+    const res = await request(app).get('/api/host').set(ownerHeaders);
+    expect(res.status).toBe(200);
+    expect(res.body.cpu_pct).toBeGreaterThanOrEqual(0);
+    expect(res.body.cpu_pct).toBeLessThanOrEqual(100);
+    expect(res.body.mem.total).toBeGreaterThan(0);
+    expect(res.body.mem.used).toBeGreaterThanOrEqual(0);
+    expect(res.body.disk).toHaveProperty('pct');
+    expect(res.body.net).toHaveProperty('rx_bytes');
+  });
+});