Initial public release

Aurum — a self-hosted personal finance operating system: cash flow,
net worth tracking, budgets, goals, recurring payments, reports,
proactive alerts, and a compound-interest returns calculator, all
bilingual (RU/EN) and mobile-first. Ships as a three-container Docker
Compose stack (Postgres + FastAPI + nginx-served React frontend).

See README.md for setup and CONTRIBUTING.md for development.

frontend/src/pages/RoiPage.tsx

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+import { useState } from "react";
+import { RoiCalculatorCard } from "@/components/roi/RoiCalculatorCard";
+import { RoiProjectionCard } from "@/components/roi/RoiProjectionCard";
+
+export function RoiPage() {
+  const [investment, setInvestment] = useState("");
+  const [monthlyIncome, setMonthlyIncome] = useState("");
+
+  const investmentAmount = Number(investment);
+  const monthlyAmount = Number(monthlyIncome);
+  const hasInputs = investment !== "" && monthlyIncome !== "" && investmentAmount > 0;
+
+  const annualIncome = monthlyAmount * 12;
+  const annualRoiPercent = hasInputs ? (annualIncome / investmentAmount) * 100 : null;
+  const paybackYears = annualRoiPercent !== null && annualIncome > 0 ? investmentAmount / annualIncome : null;
+
+  return (
+    <div className="space-y-5">
+      <RoiCalculatorCard
+        investment={investment}
+        onInvestmentChange={setInvestment}
+        monthlyIncome={monthlyIncome}
+        onMonthlyIncomeChange={setMonthlyIncome}
+        annualRoiPercent={annualRoiPercent}
+        paybackYears={paybackYears}
+      />
+
+      {annualRoiPercent !== null && (
+        <RoiProjectionCard
+          investmentAmount={investmentAmount}
+          annualIncome={annualIncome}
+          annualRoiPercent={annualRoiPercent}
+        />
+      )}
+    </div>
+  );
+}