Make fewer IQ Bible calls

- Load the narrator list only when the audio dropdown is opened
- Keep today's verse and devotional in memory for an hour (not saved)
- Back off for a minute after 'allowance used up' or unreachable; keep 'nothing here' answers
- Server shares one upstream call between identical simultaneous requests (nothing stored)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/iqbible.test.js

@@ -1,5 +1,5 @@
 // @vitest-environment node
-import { test, expect } from 'vitest';
+import { test, expect, vi } from 'vitest';
 import { resolveIqPath } from './iqbible.js';
 
 test('only listed IQ Bible routes are reachable', () => {
@@ -32,3 +32,30 @@ test('only verse and chapter text counts as cacheable text', async () => {
   expect(isTextPath('/commentaries/gill/JHN/3')).toBe(false);
   expect(resolveIqPath('/bibles/parallel', { v: 'eng_kjv,spa_rv' })).not.toBeNull();
 });
+
+test('identical requests made at the same moment share one upstream call, and nothing is kept afterwards', async () => {
+  vi.resetModules();
+  process.env.IQBIBLE_API_KEY = 'k';
+  const realFetch = globalThis.fetch;
+  let upstreamCalls = 0;
+  vi.stubGlobal('fetch', vi.fn(async (url, opts) => {
+    if (String(url).startsWith('http://localhost')) return realFetch(url, opts); // the test's own requests
+    upstreamCalls += 1;
+    await new Promise((r) => setTimeout(r, 30));
+    return new Response(JSON.stringify({ data: 1 }), { status: 200, headers: { 'content-type': 'application/json' } });
+  }));
+  const { registerIqBibleRoutes } = await import('./iqbible.js');
+  const express = (await import('express')).default;
+  const app = express();
+  app.use((req, _res, next) => { req.session = { userId: 'u1' }; next(); });
+  registerIqBibleRoutes(app, (_req, _res, next) => next());
+  const srv = await new Promise((resolve) => { const s = app.listen(0, () => resolve(s)); });
+  const url = `http://localhost:${srv.address().port}/api/iq/devotionals/today`;
+  try {
+    const together = await Promise.all([realFetch(url), realFetch(url), realFetch(url)]);
+    expect(together.map((r) => r.status)).toEqual([200, 200, 200]);
+    expect(upstreamCalls).toBe(1);
+    await realFetch(url); // afterwards: not remembered, so it asks again
+    expect(upstreamCalls).toBe(2);
+  } finally { srv.close(); vi.unstubAllGlobals(); delete process.env.IQBIBLE_API_KEY; }
+});