feat(deploy): docker compose + nginx static for netcup VPS

Dockerfile

@@ -0,0 +1,45 @@
+# Multi-stage: build the Vite static site, then serve via nginx.
+
+# ── Build stage ────────────────────────────────────────────────────────────
+FROM node:20-alpine AS build
+WORKDIR /app
+
+# Install dependencies first (cache layer)
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# Copy source and build
+COPY . .
+
+# Vite picks up VITE_* at build time. Pass via --build-arg.
+ARG VITE_SUPABASE_URL
+ARG VITE_SUPABASE_ANON_KEY
+ENV VITE_SUPABASE_URL=$VITE_SUPABASE_URL
+ENV VITE_SUPABASE_ANON_KEY=$VITE_SUPABASE_ANON_KEY
+
+RUN npm run build
+
+# ── Runtime stage ──────────────────────────────────────────────────────────
+FROM nginx:1.27-alpine
+
+# Static SPA: redirect 404s to index.html so client-side routing works.
+RUN printf 'server {\n\
+    listen 80;\n\
+    server_name _;\n\
+    root /usr/share/nginx/html;\n\
+    index index.html;\n\
+    location / {\n\
+        try_files $uri $uri/ /index.html;\n\
+    }\n\
+    location /health {\n\
+        access_log off;\n\
+        return 200 "ok\\n";\n\
+        add_header Content-Type text/plain;\n\
+    }\n\
+}\n' > /etc/nginx/conf.d/default.conf
+
+COPY --from=build /app/dist /usr/share/nginx/html
+
+EXPOSE 80
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+    CMD wget -qO- http://127.0.0.1/health || exit 1