chore: add Docker config for Dokploy deploy

.dockerignore

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+node_modules
+dist
+.env*
+.git
+tests
+*.md

Dockerfile

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+# Stage 1: build
+FROM node:20-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+
+# Variables de entorno inyectadas como build args desde Dokploy
+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
+
+# Stage 2: serve
+FROM nginx:alpine
+COPY --from=builder /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]

docs/.dockerignore

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+node_modules
+dist
+.env*
+.git
+tests
+*.md

nginx.conf

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+server {
+    listen 80;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # SPA routing — todas las rutas van a index.html
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Cache agresivo para assets con hash en el nombre
+    location /assets/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # No cachear index.html
+    location = /index.html {
+        add_header Cache-Control "no-cache, no-store, must-revalidate";
+    }
+
+    gzip on;
+    gzip_types text/plain text/css application/javascript application/json image/svg+xml;
+    gzip_min_length 1000;
+}