Week 1 infrastructure: Docker environments, deploy pipeline, bookstore-core scaffold

Docker Compose environments for dev/staging/production (MariaDB, Redis,
Caddy, Action Scheduler cron sidecar), an idempotent deploy script,
git-hook-based deploy pipeline, backup/restore scripts, and the
bookstore-core plugin stub with WooCommerce HPOS compatibility declared.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docker/php/Dockerfile

@@ -0,0 +1,23 @@
+# PHP-FPM + WordPress core, plus the tooling deploy.sh and the cron
+# sidecar need: wp-cli, composer, and the redis extension for object cache.
+FROM wordpress:php8.3-fpm
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        git \
+        unzip \
+        less \
+        default-mysql-client \
+    && pecl install redis \
+    && docker-php-ext-enable redis \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
+
+RUN curl -o /usr/local/bin/wp -sSL \
+        https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar \
+    && chmod +x /usr/local/bin/wp
+
+COPY php.ini /usr/local/etc/php/conf.d/zz-bookstore.ini
+
+WORKDIR /var/www/html

docker/php/php.ini

@@ -0,0 +1,13 @@
+[PHP]
+upload_max_filesize = 32M
+post_max_size = 32M
+memory_limit = 256M
+max_execution_time = 120
+max_input_vars = 3000
+
+[opcache]
+opcache.enable = 1
+opcache.memory_consumption = 128
+opcache.max_accelerated_files = 10000
+opcache.validate_timestamps = 1
+opcache.revalidate_freq = 2