RegWatch frontend : React/Vite -> nginx + Docker/CI homelab

- URL d'API externalisée (VITE_API_URL bakée au build), plus de localhost en dur
- Dockerfile multi-stage pnpm build -> nginx (fallback SPA)
- docker-compose (Watchtower) + .gitea/workflows/build.yml

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/main.tsx

@@ -0,0 +1,19 @@
+import React from "react";
+import ReactDOM from "react-dom/client";
+import { BrowserRouter } from "react-router-dom";
+
+import App from "./App";
+
+import "./index.css";
+
+ReactDOM.createRoot(
+  document.getElementById("root")!
+).render(
+  <React.StrictMode>
+
+    <BrowserRouter>
+      <App />
+    </BrowserRouter>
+
+  </React.StrictMode>
+);