feat: Crypto.com-Client und Backfill-Script

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/server/market/cryptocom.test.ts

@@ -0,0 +1,21 @@
+import { expect, test } from 'bun:test';
+import { parseCandlestickResponse } from './cryptocom';
+
+test('parst Crypto.com-Candlestick-Response', () => {
+  const json = {
+    result: {
+      data: [
+        { t: 900000, o: '1.0', h: '1.2', l: '0.9', c: '1.1', v: '1000' },
+        { t: 1800000, o: '1.1', h: '1.3', l: '1.0', c: '1.2', v: '500' },
+      ],
+    },
+  };
+  const out = parseCandlestickResponse(json);
+  expect(out).toHaveLength(2);
+  expect(out[0]).toEqual({ ts: 900000, open: 1, high: 1.2, low: 0.9, close: 1.1, volume: 1000 });
+});
+
+test('leere/fehlende Daten → leeres Array', () => {
+  expect(parseCandlestickResponse({})).toEqual([]);
+  expect(parseCandlestickResponse({ result: {} })).toEqual([]);
+});