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/admin/page.tsx

@@ -5,7 +5,7 @@ import { count, eq, sql } from "@epicure/db";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 import { Users, BookOpen, Sparkles, Image } from "lucide-react";
 
-export const metadata: Metadata = { title: "Admin Overview" };
+export const metadata: Metadata = {};
 
 export default async function AdminPage() {
   const currentMonth = new Date().toISOString().slice(0, 7);