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/ai-config/page.tsx

@@ -5,7 +5,7 @@ import { CheckCircle, XCircle, Database, Cpu } from "lucide-react";
 import Link from "next/link";
 import { getAllSiteSettings } from "@/lib/site-settings";
 
-export const metadata: Metadata = { title: "AI Config" };
+export const metadata: Metadata = {};
 
 function resolveProvider(settings: Record<string, { value: string | null }>) {
   if (settings["OPENROUTER_API_KEY"]?.value) return { provider: "OpenRouter", description: "Routes to many models via openrouter.ai" };