feat: pipeline CI + Docker pour déploiement sur sonic

- Dockerfile multi-stage (node:20 build + nginx:alpine serve)
- nginx.conf SPA avec try_files et gzip
- docker-compose.yml avec labels Registrator/Fabio (SERVICE_80_CHECK_TCP)
- .woodpecker.yml : validate, security-check, build-image, SBOM, write-env,
  test-env, deploy (stop→acme→up), test-deploy, healthcheck
- .gitignore : ajout .env et /.reports/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,11 @@
+FROM node:20-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN VITE_USE_LIVE_API=true npm run build
+
+FROM nginx:alpine
+COPY --from=builder /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80