Initial commit: investment dashboard with contributions panel and forecast chart

React + Vite frontend with a local-JSON-backed API (Vite middleware) for
tracking portfolio holdings, contributions/withdrawals, recurring
contribution plans, and a forecast chart comparing the portfolio's real
value against a same-contributions S&P 500 benchmark.

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

server/types.ts

@@ -0,0 +1,86 @@
+export type AssetClass = "Renta Variable" | "Renta Fija" | "Liquidez";
+
+export interface Holding {
+  name: string;
+  value: number;
+  changeAmount: number;
+  changePercent: number;
+  assetClass: AssetClass;
+  region: string;
+}
+
+export interface Portfolio {
+  asOf: string;
+  cash: number;
+  invested: number;
+  marketValueChange: number;
+  marketValueChangePercent: number;
+  assetAllocation: Record<string, number>;
+  holdings: Holding[];
+}
+
+export interface HistorySnapshot {
+  date: string;
+  marketValue: number;
+}
+
+export interface History {
+  snapshots: HistorySnapshot[];
+}
+
+/**
+ * aportacion/retirada = external cash flow (bank <-> account) and count toward TWR/baseline math.
+ * suscripcion_fondo/reembolso_fondo = internal moves between cash and a fund; net-zero on total
+ * account value, so they're excluded from flow math but still shown in the movements ledger.
+ * apertura = informational account-opening marker.
+ */
+export type MovementKind =
+  | "aportacion"
+  | "retirada"
+  | "suscripcion_fondo"
+  | "reembolso_fondo"
+  | "apertura"
+  | "otro";
+
+export interface Movement {
+  id: string;
+  date: string;
+  kind: MovementKind;
+  amount: number;
+  description?: string;
+}
+
+export type Frequency = "weekly" | "biweekly" | "monthly" | "quarterly" | "yearly";
+
+export interface RecurringPlan {
+  id: string;
+  amount: number;
+  frequency: Frequency;
+  startDate: string;
+  endDate?: string;
+  active: boolean;
+  note?: string;
+}
+
+export interface Contributions {
+  recurringPlans: RecurringPlan[];
+  movements: Movement[];
+}
+
+export interface Settings {
+  inceptionDate: string;
+  forecastYears: number;
+  returnAssumption: "historical" | "custom";
+  customAnnualReturnPct?: number;
+}
+
+export interface SP500Point {
+  date: string;
+  close: number;
+}
+
+export interface SP500Data {
+  source: string;
+  updatedAt: string;
+  series: SP500Point[];
+}