phase-7: code restructure

server/models/Asset.ts

@@ -0,0 +1,26 @@
+import type { AssetType } from '../types';
+import type { AssetData } from '../types/models.model';
+
+export class Asset {
+  ticker: string;
+  currentPrice: number;
+  type: AssetType;
+
+  constructor(data: AssetData) {
+    this.ticker = (data.ticker || 'UNKNOWN').toUpperCase();
+    this.currentPrice = (data.currentPrice as number) || 0;
+    this.type = (data.type || 'STOCK').toUpperCase() as AssetType;
+  }
+
+  formatCurrency(val: number | null | undefined): string {
+    return val ? `$${val.toFixed(2)}` : 'N/A';
+  }
+
+  formatLargeNumber(num: number | null | undefined): string {
+    if (!num) return 'N/A';
+    if (num >= 1e12) return `${(num / 1e12).toFixed(2)}T`;
+    if (num >= 1e9) return `${(num / 1e9).toFixed(2)}B`;
+    if (num >= 1e6) return `${(num / 1e6).toFixed(2)}M`;
+    return num.toString();
+  }
+}