feat: add Docker Compose setup for Coolify deployment

- Dockerfile: php:8.2-apache with pdo_mysql, curl, mod_rewrite
- docker-compose.yml: app + MySQL 8.0, healthchecks, named volumes
- .dockerignore: exclude .env, .git, uploads, docs
- .gitignore: add .env

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

Dockerfile

@@ -0,0 +1,19 @@
+FROM php:8.2-apache
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        curl \
+    && docker-php-ext-install pdo_mysql \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN a2enmod rewrite \
+    && echo "ServerName localhost" >> /etc/apache2/apache2.conf \
+    && sed -i 's|AllowOverride None|AllowOverride All|g' /etc/apache2/apache2.conf
+
+COPY . /var/www/html/
+
+RUN mkdir -p /var/www/html/uploads \
+    && chown -R www-data:www-data /var/www/html \
+    && chmod 755 /var/www/html \
+    && chmod 777 /var/www/html/uploads
+
+EXPOSE 80