Phase 0 : scaffolding complet

- Structure monorepo (backend Symfony, frontend React/Vite)
- Docker : FrankenPHP + PostgreSQL/PostGIS + Redis + Traefik labels
- Caddyfile, Dockerfile, .env.example, .gitignore
- MapLibre GL JS + react-map-gl installés
- Roadmap mise à jour

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

docker/php/Caddyfile

@@ -0,0 +1,25 @@
+{
+    frankenphp
+    order php_server before file_server
+}
+
+:80 {
+    root * /app/public
+
+    # Assets Symfony
+    handle /bundles/* {
+        file_server
+    }
+
+    # SPA React (fichiers statiques buildés dans public/spa/)
+    handle /spa/* {
+        file_server
+    }
+
+    # Tout le reste → Symfony (front controller index.php)
+    handle {
+        php_server
+    }
+
+    encode gzip
+}

docker/php/Dockerfile

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+FROM dunglas/frankenphp:latest-php8.3
+
+# Dépendances système
+RUN apt-get update && apt-get install -y \
+    libpq-dev \
+    libzip-dev \
+    unzip \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Extensions PHP
+RUN install-php-extensions \
+    pdo_pgsql \
+    pgsql \
+    redis \
+    zip \
+    intl \
+    opcache \
+    apcu
+
+# Composer
+COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
+
+WORKDIR /app
+
+# Copie des dépendances en premier (cache Docker)
+COPY backend/composer.json backend/composer.lock ./
+RUN composer install --no-dev --optimize-autoloader --no-scripts
+
+# Copie du reste
+COPY backend/ .
+
+RUN composer dump-autoload --optimize \
+    && php bin/console cache:warmup --env=prod
+
+COPY docker/php/Caddyfile /etc/caddy/Caddyfile