feat(playtest): add standalone multi-action preview #21

	name: Backend CI

	on:
	push:
	pull_request:

	# 同一 ref 新 run 取消旧的,省额度
	concurrency:
	group: ci-${{ github.ref }}
	cancel-in-progress: true

	# 开源项目最小权限
	permissions:
	contents: read

	jobs:
	lint-and-test:
	runs-on: ubuntu-latest
	defaults:
	run:
	working-directory: backend # uv workspace 在 backend/,不是 repo 根
	steps:
	- uses: actions/checkout@v7

	- name: Install uv
	# setup-uv 自 v8.0.0 起停止发布 floating major tag(@v7/@v8),
	# 出于安全只发布 immutable tag,故用具体版本号
	uses: astral-sh/setup-uv@v8.3.2
	with:
	enable-cache: true

	- name: Set up Python
	run: uv python install 3.12

	- name: Install dependencies
	run: uv sync --frozen # 用提交的 uv.lock 锁定版本,不偷偷升级

	- name: Ruff
	run: uv run ruff check .

	- name: Import-linter (分层契约)
	run: uv run lint-imports

	- name: Pytest
	run: uv run pytest -q

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