feat(weather): /api/weather Open-Meteo proxy with 15-min cache

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

tests/api/weather.test.js

@@ -0,0 +1,27 @@
+import { describe, it, expect, beforeAll, beforeEach, vi } from 'vitest';
+import request from 'supertest';
+import { setup } from './helpers.js';
+import * as weather from '../../lib/weather.js';
+
+let app, ownerHeaders;
+beforeAll(async () => { ({ app, ownerHeaders } = await setup()); });
+beforeEach(() => weather._resetCache());
+
+const SAMPLE = { current: { temperature_2m: 14.2, apparent_temperature: 12.1, relative_humidity_2m: 71, wind_speed_10m: 9, weather_code: 3 } };
+
+describe('weather api', () => {
+  it('401 without auth', async () => {
+    expect((await request(app).get('/api/weather')).status).toBe(401);
+  });
+  it('returns mapped weather and caches the upstream call', async () => {
+    const fetcher = vi.fn().mockResolvedValue(SAMPLE);
+    weather._setFetcher(fetcher);
+    const r1 = await request(app).get('/api/weather').set(ownerHeaders);
+    expect(r1.status).toBe(200);
+    expect(r1.body.temp).toBe(14.2);
+    expect(r1.body.humidity).toBe(71);
+    expect(typeof r1.body.label).toBe('string');   // weather_code → text
+    await request(app).get('/api/weather').set(ownerHeaders);  // 2nd hit
+    expect(fetcher).toHaveBeenCalledTimes(1);       // cached
+  });
+});