feat(install): 零输入一条命令部署 + 双架构发布包

- docker compose up -d 直接启动:entrypoint 在未显式提供密钥时自动生成随机
  JWT_SECRET/ENCRYPTION_KEY 并持久化到数据卷 .secrets.env(0600,重启不变),
  显式环境变量优先(单显式不被持久化文件覆盖,四场景实测);compose 去掉 :? 强制
- build.sh --dist / make dist:linux amd64 + arm64 两个 tar.gz(二进制+docs+homepage+README),
  实测 15M/13M;安装文档重写为三方式(kubernetes/install.sh 一键、compose 一条命令、release 包)
- README 快速开始同步

Makefile

@@ -108,6 +108,9 @@ clean:
 	@echo "Cleanup complete."
 
 # Linting
+dist:
+	APP_VERSION=$$(git describe --tags --abbrev=0 2>/dev/null || echo dev) bash build.sh --dist
+
 lint:
 	@echo "Validating Dockerfile..."
 	@docker run --rm -i hadolint/hadolint < Dockerfile 2>/dev/null || echo "hadolint not available, install from: https://github.com/hadolint/hadolint"