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

vite.config.ts

@@ -7,4 +7,13 @@ export default defineConfig({
   resolve: {
     tsconfigPaths: true,
   },
+  server: {
+    proxy: {
+      "/api": {
+        target: "http://127.0.0.1:3000",
+        changeOrigin: true,
+        secure: false,
+      },
+    },
+  },
 });