Add TTRPG Player marketing landing site.

React/Vite landing with RU/EN i18n, live USD pricing, download links to updates.mailib.ru, and donate.stream checkout.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/main.tsx

@@ -0,0 +1,22 @@
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+
+import { App } from "./App";
+import { LocaleProvider } from "./i18n/LocaleProvider";
+import { ExchangeRateProvider } from "./providers/ExchangeRateProvider";
+import "./styles/global.css";
+
+const rootEl = document.getElementById("root");
+if (!rootEl) {
+  throw new Error("Root element #root not found");
+}
+
+createRoot(rootEl).render(
+  <StrictMode>
+    <LocaleProvider>
+      <ExchangeRateProvider>
+        <App />
+      </ExchangeRateProvider>
+    </LocaleProvider>
+  </StrictMode>,
+);