feat(health): service_status cache table + repo

tests/repos/service_status.test.js

@@ -0,0 +1,14 @@
+import { describe, it, expect, beforeAll } from 'vitest';
+import { resetDb } from '../helpers/db.js';
+import { migrateUp } from '../../lib/db/migrate.js';
+import * as repo from '../../lib/db/repos/service_status.js';
+
+beforeAll(async () => { await resetDb(); await migrateUp(); });
+describe('service_status repo', () => {
+  it('upserts and reads all', async () => {
+    await repo.upsert({ service_id: 'gitea', status: 'ok', latency_ms: 12, detail: '200' });
+    await repo.upsert({ service_id: 'gitea', status: 'down', latency_ms: null, detail: 'ECONN' });
+    const all = await repo.all();
+    expect(all.find(r => r.service_id === 'gitea').status).toBe('down');
+  });
+});