fix: browser tab title should always just say "Epicure"

Root layout used title.template ("%s | Epicure") and 38 pages set
their own title, producing "Recipes | Epicure", "Messages — Epicure",
etc. Drop the template, set a flat "Epicure" default, and clear every
page's title override so they all inherit it.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/app/(app)/settings/api-keys/page.tsx

@@ -7,7 +7,7 @@ import { db, apiKeys, eq } from "@epicure/db";
 import { ApiKeysManager } from "@/components/settings/api-keys-manager";
 import { getMessages } from "@/lib/i18n/server";
 
-export const metadata: Metadata = { title: "API Keys" };
+export const metadata: Metadata = {};
 
 export default async function ApiKeysPage() {
   const session = await auth.api.getSession({ headers: await headers() });