Add Docker configuration for Hugging Face Spaces

- Dockerfile with multi-stage build (node + nginx)
- Serves on port 7860 for HF Spaces compatibility
- README with HF Spaces metadata and deployment instructions
- .dockerignore to optimize build context

.dockerignore

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+node_modules
+dist
+.git
+.gitignore
+.env
+.env.*
+!.env.example
+.DS_Store
+*.log
+.claude
+.idea

Dockerfile

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+# Build stage
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Mapbox token passed as build arg (set in HF Spaces secrets)
+ARG VITE_MAPBOX_TOKEN
+ENV VITE_MAPBOX_TOKEN=$VITE_MAPBOX_TOKEN
+
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+RUN npm run build
+
+# Production stage
+FROM nginx:alpine
+
+# Copy built files
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Custom nginx config for HF Spaces (port 7860)
+RUN echo 'server { \
+    listen 7860; \
+    server_name localhost; \
+    location / { \
+        root /usr/share/nginx/html; \
+        index index.html; \
+        try_files $uri $uri/ /index.html; \
+    } \
+}' > /etc/nginx/conf.d/default.conf
+
+EXPOSE 7860
+
+CMD ["nginx", "-g", "daemon off;"]

README.md

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+---
+title: Patrouille de France Tracker
+emoji: ✈️
+colorFrom: blue
+colorTo: red
+sdk: docker
+pinned: false
+license: mit
+---
+
+# Patrouille de France Airshow Tracker
+
+Interactive map tracking Patrouille de France airshows with animated flight paths.
+
+## Features
+
+- Interactive Mapbox map centered on France
+- Timeline of 2025-2026 airshows
+- Animated flight paths with contrail effects
+- Alpha Jet marker following the path
+- Countdown to next event
+
+## Local Development
+
+```bash
+npm install
+npm run dev
+```
+
+## Environment Variables
+
+Create a `.env` file with your Mapbox token:
+
+```
+VITE_MAPBOX_TOKEN=your_token_here
+```
+
+## Hugging Face Spaces Deployment
+
+1. Create a new Space with Docker SDK
+2. Add `VITE_MAPBOX_TOKEN` as a secret in Settings → Variables and secrets
+3. Push the code to the Space repository