chore: add a command-line translation check

Mirrors the button on the settings page, for verifying a deployment from
the host before anyone signs in, and for watching the cache work.

Measured against the live service, which settles a question the spec had
guessed at: a short phrase takes between 4.6 and 10.7 seconds, because
the endpoint really does start a Claude Code process. The ten-second
timeout the spec assumed would have failed intermittently on exactly the
kind of message this shop writes. Thirty seconds stands.

Cached answers come back in 3 milliseconds, so the cache is worth
roughly three thousand times its complexity.

Quality checked on real phrasing: times and dates survive unchanged
("Ouverture retardée à 14:00" to "Delayed opening at 14:00 today"),
which is what the prompt asks for and what the screen needs.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012cSY9pVhZmJUKNN7wf1Myd

package.json

@@ -19,7 +19,8 @@
     "screen:preview": "tsx scripts/preview.ts",
     "brand": "tsx scripts/brand.ts",
     "e2e": "playwright test",
-    "holidays:sync": "tsx scripts/sync-holidays.ts"
+    "holidays:sync": "tsx scripts/sync-holidays.ts",
+    "translate:test": "tsx scripts/test-translation.ts"
   },
   "dependencies": {
     "@fontsource-variable/inter": "^5.3.0",

scripts/test-translation.ts

@@ -0,0 +1,56 @@
+/**
+ * Round-trips a phrase through the translation service.
+ *
+ *   npm run translate:test  ["texte à traduire"]
+ *
+ * The settings page has the same button; this exists to check a deployment
+ * from the host, before anyone signs in, and to see the cache working.
+ */
+
+import 'dotenv/config';
+
+import { prisma } from '../lib/db';
+import { defaultProvider, translateToEnglish } from '../lib/translation/service';
+
+async function main(): Promise<void> {
+  const text = process.argv[2] ?? 'Fermeture exceptionnelle jeudi après-midi';
+  const provider = defaultProvider();
+
+  if (!provider) {
+    console.error('Service non configuré : renseignez TRANSLATION_API_URL et TRANSLATION_API_KEY.');
+    process.exitCode = 1;
+    return;
+  }
+
+  console.log(`Modèle   : ${provider.model}`);
+  console.log(`Français : ${text}`);
+
+  const started = Date.now();
+  const first = await translateToEnglish(text, provider);
+  const elapsed = Date.now() - started;
+
+  if (!first.ok) {
+    console.error(`Échec    : ${first.error}`);
+    process.exitCode = 1;
+    return;
+  }
+
+  console.log(`Anglais  : ${first.text}`);
+  console.log(`Durée    : ${elapsed} ms (cache : ${first.cached ? 'oui' : 'non'})`);
+
+  // Second pass proves the cache: it must not touch the network at all.
+  const again = Date.now();
+  const second = await translateToEnglish(text, provider);
+  console.log(
+    `2e appel : ${Date.now() - again} ms (cache : ${second.ok && second.cached ? 'oui' : 'non'})`,
+  );
+}
+
+main()
+  .catch((error: unknown) => {
+    console.error(error);
+    process.exitCode = 1;
+  })
+  .finally(() => {
+    void prisma.$disconnect();
+  });