feat: Docker setup voor Coolify deploy (nginx + SPA fallback)

Multi-stage Dockerfile: node bouwt Vite output, nginx serveert dist/.
nginx.conf: SPA try_files fallback, gzip, cache headers voor /assets/.
.dockerignore: houdt build context schoon (node_modules, dist, .git).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.dockerignore

@@ -0,0 +1,18 @@
+node_modules
+dist
+.git
+.gitignore
+.env
+.env.*
+.vscode
+.claude
+*.log
+npm-debug.log*
+.DS_Store
+README.md
+PRD.md
+LOGBOEK.md
+preflight.sh
+content
+.dashboard.yml
+.specstory

Dockerfile

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+# Multi-stage build voor de Claude Code Workshop sales page
+# Stage 1: Node.js bouwt de Vite production bundle
+# Stage 2: Nginx serveert de statische output
+
+FROM node:20-alpine AS build
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+COPY . .
+RUN npm run build
+
+FROM nginx:alpine
+
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /app/dist /usr/share/nginx/html
+
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]

nginx.conf

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+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Gzip voor tekstuele assets
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_types text/plain text/css text/xml application/json application/javascript application/xml+rss application/atom+xml image/svg+xml;
+
+    # Cache hashed assets uit de Vite build (bestandsnaam bevat hash)
+    location /assets/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # SPA fallback: stuur alle onbekende routes naar index.html
+    # zodat React Router de routes /bedankt, /inschrijven etc. afhandelt
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # index.html zelf nooit cachen, anders zie je geen nieuwe deploys
+    location = /index.html {
+        add_header Cache-Control "no-cache, no-store, must-revalidate";
+        expires 0;
+    }
+}