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.ts

@@ -1,3 +1,6 @@
 import { type RouteConfig, index } from "@react-router/dev/routes";
 
-export default [index("routes/home.tsx")] satisfies RouteConfig;
+export default [
+  index("routes/home.tsx"),
+  index("routes/stocks.tsx"),
+] satisfies RouteConfig;