feat: add stock indicators route and Alpaca account info

- New /stocks route with StockViewer component
- New /api/indicators endpoint with SMA, EMA, RSI, MACD
- New /api/alpaca/account endpoint
- AlpacaAccountInfo component on home page
- Indicator calculation utilities
- Tests for utilities and components
- Vite proxy config for /api

app/routes/home.tsx

@@ -1,5 +1,6 @@
 import type { Route } from "./+types/home";
 import { Welcome } from "../welcome/welcome";
+import AlpacaAccountInfo from "../components/AlpacaAccountInfo";
 
 export function meta({}: Route.MetaArgs) {
   return [
@@ -9,5 +10,12 @@ export function meta({}: Route.MetaArgs) {
 }
 
 export default function Home() {
-  return <Welcome />;
+  return (
+    <>
+      <Welcome />
+      <div className="container mx-auto p-4 max-w-2xl">
+        <AlpacaAccountInfo />
+      </div>
+    </>
+  );
 }