Complete monorepo toolchain setup (tasks 1.1-1.7)

- Turborepo + pnpm workspaces with catalog for shared dependency versions
- TypeScript strict config (base + per-package extends)
- Tailwind CSS v4 via @tailwindcss/vite plugin
- ESLint + Prettier shared config
- Planner app scaffolded with React Router 7 (port 3001)
- Journal app scaffolded with React Router 7 (port 3000)
- Both apps build and start successfully via turbo

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/journal/app/routes/home.tsx

@@ -0,0 +1,17 @@
+import type { Route } from "./+types/home";
+
+export function meta({}: Route.MetaArgs) {
+  return [
+    { title: "trails.cool" },
+    { name: "description", content: "Your outdoor activity journal" },
+  ];
+}
+
+export default function Home() {
+  return (
+    <div className="mx-auto max-w-4xl px-4 py-16">
+      <h1 className="text-4xl font-bold text-gray-900">trails.cool</h1>
+      <p className="mt-4 text-lg text-gray-600">Your outdoor activity journal</p>
+    </div>
+  );
+}