feat: initialize Next.js project with database schema

- Set up Next.js with App Router, TypeScript, Tailwind CSS
- Configure shadcn/ui with dark theme
- Install dependencies: lightweight-charts, papaparse, lucide-react
- Set up Drizzle ORM with better-sqlite3
- Create database schema for candles and annotations tables
- Generate migration SQL

src/app/page.tsx

@@ -0,0 +1,10 @@
+export default function Home() {
+  return (
+    <main className="min-h-screen p-8">
+      <h1 className="text-2xl font-bold">Candle Annotator</h1>
+      <p className="mt-4 text-slate-400">
+        Upload CSV data and annotate candlestick charts
+      </p>
+    </main>
+  );
+}