ci: add forgejo actions pipeline with traefik labels and https health checks

frontend/Dockerfile.prod

@@ -0,0 +1,28 @@
+# ── Build ─────────────────────────────────────────────────────────────────────
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+
+# VITE_API_URL is injected at build time via --build-arg
+ARG VITE_API_URL
+ENV VITE_API_URL=${VITE_API_URL}
+
+RUN npm run build
+
+# ── Runtime (nginx) ───────────────────────────────────────────────────────────
+FROM nginx:alpine
+
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# SPA fallback: all routes → index.html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+HEALTHCHECK --interval=15s --timeout=5s --start-period=10s --retries=3 \
+  CMD wget -qO- http://localhost/health || exit 1