feat(i18n): translate hardcoded strings across print, public recipe, and recipe management UI

Wires dozens of components and server pages to next-intl instead of hardcoded
English text, and adds a lightweight getMessages/formatMessage helper for
server components (print pages, public recipe page, cook metadata) since
next-intl/server isn't wired into this app's routing. Backfills missing
en/fr message keys that existing code already referenced but fr.json lacked.

apps/web/components/settings/byok-manager.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { useState } from "react";
+import { useTranslations } from "next-intl";
 import { toast } from "sonner";
 import { Key, Trash2, Check } from "lucide-react";
 import { Button } from "@/components/ui/button";
@@ -17,6 +18,7 @@ const PROVIDERS: { id: Provider; label: string; placeholder: string }[] = [
 ];
 
 export function ByokManager({ initialKeys }: { initialKeys: string[] }) {
+  const t = useTranslations("settingsForm");
   const [configuredKeys, setConfiguredKeys] = useState<Set<string>>(new Set(initialKeys));
   const [inputs, setInputs] = useState<Partial<Record<Provider, string>>>({});
   const [saving, setSaving] = useState<Provider | null>(null);
@@ -35,9 +37,9 @@ export function ByokManager({ initialKeys }: { initialKeys: string[] }) {
       if (res.ok) {
         setConfiguredKeys((prev) => new Set([...prev, provider]));
         setInputs((prev) => ({ ...prev, [provider]: "" }));
-        toast.success(`${provider} key saved`);
+        toast.success(t("byokSaved", { provider }));
       } else {
-        toast.error("Failed to save key");
+        toast.error(t("byokSaveFailed"));
       }
     } finally {
       setSaving(null);
@@ -50,9 +52,9 @@ export function ByokManager({ initialKeys }: { initialKeys: string[] }) {
       const res = await fetch(`/api/v1/ai-keys/${provider}`, { method: "DELETE" });
       if (res.ok) {
         setConfiguredKeys((prev) => { const s = new Set(prev); s.delete(provider); return s; });
-        toast.success(`${provider} key removed`);
+        toast.success(t("byokRemoved", { provider }));
       } else {
-        toast.error("Failed to remove key");
+        toast.error(t("byokRemoveFailed"));
       }
     } finally {
       setRemoving(null);