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/api-keys-manager.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { useState } from "react";
+import { useTranslations } from "next-intl";
 import { toast } from "sonner";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
@@ -30,6 +31,7 @@ function formatDate(iso: string) {
 }
 
 export function ApiKeysManager({ initialKeys }: { initialKeys: ApiKey[] }) {
+  const t = useTranslations("settingsForm");
   const [keys, setKeys] = useState<ApiKey[]>(initialKeys);
   const [name, setName] = useState("");
   const [creating, setCreating] = useState(false);
@@ -48,7 +50,7 @@ export function ApiKeysManager({ initialKeys }: { initialKeys: ApiKey[] }) {
       });
       if (!res.ok) {
         const data = await res.json() as { error?: string };
-        throw new Error(data.error ?? "Failed to create API key");
+        throw new Error(data.error ?? t("apiKeyCreateFailed"));
       }
       const data = await res.json() as CreateApiKeyResponse;
       setNewKey(data.key);
@@ -58,7 +60,7 @@ export function ApiKeysManager({ initialKeys }: { initialKeys: ApiKey[] }) {
       ]);
       setName("");
     } catch (err) {
-      toast.error(err instanceof Error ? err.message : "Failed to create API key");
+      toast.error(err instanceof Error ? err.message : t("apiKeyCreateFailed"));
     } finally {
       setCreating(false);
     }
@@ -69,11 +71,11 @@ export function ApiKeysManager({ initialKeys }: { initialKeys: ApiKey[] }) {
       const res = await fetch(`/api/v1/api-keys/${id}`, { method: "DELETE" });
       if (!res.ok) {
         const data = await res.json() as { error?: string };
-        throw new Error(data.error ?? "Failed to revoke API key");
+        throw new Error(data.error ?? t("apiKeyRevokeFailed"));
       }
       setKeys((prev) => prev.filter((k) => k.id !== id));
     } catch (err) {
-      toast.error(err instanceof Error ? err.message : "Failed to revoke API key");
+      toast.error(err instanceof Error ? err.message : t("apiKeyRevokeFailed"));
     }
   }
 
@@ -84,7 +86,7 @@ export function ApiKeysManager({ initialKeys }: { initialKeys: ApiKey[] }) {
       setCopied(true);
       setTimeout(() => setCopied(false), 2000);
     } catch {
-      toast.error("Failed to copy to clipboard");
+      toast.error(t("copyFailed"));
     }
   }
 
@@ -97,7 +99,7 @@ export function ApiKeysManager({ initialKeys }: { initialKeys: ApiKey[] }) {
           <div className="flex gap-2">
             <Input
               id="key-name"
-              placeholder="e.g. My app"
+              placeholder={t("apiKeyNamePlaceholder")}
               value={name}
               onChange={(e) => setName(e.target.value)}
               maxLength={100}