phase-7: code restructure

ui/src/lib/api/finance.ts

@@ -0,0 +1,41 @@
+import type { MarketContext, PortfolioHolding, PortfolioAdvice } from '$lib/types.js';
+
+const BASE = '/api';
+
+export async function fetchPortfolio(): Promise<{
+  advice: PortfolioAdvice[];
+  holdings: PortfolioHolding[];
+  marketContext: MarketContext | null;
+  netWorth: number | null;
+  error?: string;
+}> {
+  const res = await fetch(`${BASE}/finance/portfolio`);
+  if (!res.ok) throw new Error(await res.text());
+  return res.json();
+}
+
+export async function addHolding(
+  holding: PortfolioHolding,
+): Promise<{ holdings: PortfolioHolding[] }> {
+  const res = await fetch(`${BASE}/finance/holdings`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(holding),
+  });
+  if (!res.ok) throw new Error(await res.text());
+  return res.json();
+}
+
+export async function removeHolding(ticker: string): Promise<{ holdings: PortfolioHolding[] }> {
+  const res = await fetch(`${BASE}/finance/holdings/${ticker}`, {
+    method: 'DELETE',
+  });
+  if (!res.ok) throw new Error(await res.text());
+  return res.json();
+}
+
+export async function fetchMarketContext(): Promise<MarketContext> {
+  const res = await fetch(`${BASE}/finance/market-context`);
+  if (!res.ok) throw new Error(await res.text());
+  return res.json();
+}