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/tiers/page.tsx

@@ -2,7 +2,7 @@ import type { Metadata } from "next";
 import { db, tierDefinitions } from "@epicure/db";
 import { TierLimitsForm } from "@/components/admin/tier-limits-form";
 
-export const metadata: Metadata = { title: "Tier Limits – Admin" };
+export const metadata: Metadata = {};
 
 export default async function AdminTiersPage() {
   const tiers = await db.select().from(tierDefinitions);