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>

Makefile

@@ -0,0 +1,29 @@
+ENV ?= dev
+COMPOSE = docker compose -f docker-compose.yml -f docker-compose.$(ENV).yml --env-file .env.$(ENV)
+
+.PHONY: up down ps logs shell wp deploy backup
+
+up:
+	$(COMPOSE) up -d --build
+
+down:
+	$(COMPOSE) down
+
+ps:
+	$(COMPOSE) ps
+
+logs:
+	$(COMPOSE) logs -f
+
+shell:
+	$(COMPOSE) exec wordpress bash
+
+# make wp ENV=staging ARGS="plugin list"
+wp:
+	$(COMPOSE) exec wordpress wp $(ARGS) --allow-root
+
+deploy:
+	./deploy/deploy.sh $(ENV)
+
+backup:
+	./deploy/backup.sh $(ENV)