Refactor for TDD workflow with Vitest and ESLint

- Move API keys from hardcoded values to .env via dotenv
- Extract business logic into src/trading.ts with dependency injection
- Add typed AlpacaClient interface, replace `any` on Alpaca class
- Add Vitest test suites for trading logic and Alpaca wrapper (14 tests)
- Set up ESLint with @typescript-eslint for linting
- Fix getAsset to pass symbol string directly to SDK
- Fix typo (alpacha -> alpaca), remove unused ws/node-fetch deps
- Update .gitignore for node_modules and .env

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/trading.ts

@@ -0,0 +1,46 @@
+import { Alpaca } from "./alpaca";
+
+export function wait(ms: number) {
+    return new Promise((resolve) => {
+        setTimeout(resolve, ms);
+    });
+}
+
+export async function printAsset(alpaca: Alpaca, symbol: string) {
+    const asset = await alpaca.getAsset(symbol);
+    if (asset && asset.fractionable)
+        console.log(symbol + ' is fractional')
+    else
+        console.log(symbol + ' is not fractional')
+}
+
+export async function accountBalance(alpaca: Alpaca) {
+    const account = await alpaca.getAccount();
+    return account.cash;
+}
+
+export async function waitForNextOpen(alpaca: Alpaca) {
+    const clock = await alpaca.getClock();
+    return wait(new Date(clock.next_open).valueOf() - new Date().valueOf());
+}
+
+export async function runDay(alpaca: Alpaca) {
+    console.log('waiting for open');
+    await waitForNextOpen(alpaca);
+
+    await wait(60000); //wait a minute
+
+    const q = await alpaca.getLatestQuote('TQQQ');
+    await wait(1000);
+
+    const q2 = await alpaca.getLatestQuote('TQQQ');
+
+    if (q2.ap - q.ap > 0) {
+        //up day
+        console.log('up day: ', new Date())
+    }
+    else {
+        //down day
+        console.log('down day', new Date());
+    }
+}