Add Docker one-click deploy and data migration docs.

Enable PHP 8.2 + Apache compose stack with persistent data/uploads volumes and PhpSpreadsheet for xlsx import/export.

Co-authored-by: Cursor <cursoragent@cursor.com>

Dockerfile

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+FROM php:8.2-apache
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        libzip-dev \
+        libxml2-dev \
+        unzip \
+        git \
+    && docker-php-ext-install pdo_sqlite zip \
+    && a2enmod rewrite headers \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
+
+WORKDIR /var/www/html
+
+COPY docker/apache-vhost.conf /etc/apache2/sites-available/000-default.conf
+COPY docker/entrypoint.sh /usr/local/bin/entrypoint.sh
+RUN chmod +x /usr/local/bin/entrypoint.sh
+
+COPY composer.json ./
+RUN composer install --no-dev --prefer-dist --no-interaction --optimize-autoloader
+
+COPY app ./app
+COPY public ./public
+COPY data ./data
+COPY uploads ./uploads
+
+RUN chown -R www-data:www-data /var/www/html/data /var/www/html/uploads \
+    && chmod -R 775 /var/www/html/data /var/www/html/uploads
+
+EXPOSE 80
+
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
+CMD ["apache2-foreground"]