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>

Dockerfile

@@ -0,0 +1,17 @@
+# --- build (Vite bake VITE_API_URL au build) ---
+FROM node:24-alpine AS build
+WORKDIR /app
+RUN npm install -g pnpm@latest
+COPY package.json pnpm-lock.yaml ./
+RUN pnpm install --no-frozen-lockfile
+COPY . .
+# URL publique de l'API, injectée dans le bundle au build (Vite n'a pas d'env au runtime).
+ARG VITE_API_URL=https://regwatch-api.nfteam.ovh
+ENV VITE_API_URL=$VITE_API_URL
+RUN pnpm build
+
+# --- serve (nginx statique, fallback SPA) ---
+FROM nginx:alpine
+COPY --from=build /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80