baseline: 批次A-D 成果 + membership 半成品（测试红）

backend/conftest.py

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+"""共享 fixtures：tenant/org/user/async_api_client + postgres 用例自动跳过。"""
+
+import pytest
+import pytest_asyncio
+from model_bakery import baker
+from django.test import AsyncClient
+
+from apps.core.models import Tenant, Org, TenantMembership
+
+
+@pytest.fixture
+def tenant(db):
+    return baker.make(Tenant, code="test", name="测试租户", is_active=True)
+
+
+@pytest.fixture
+def other_tenant(db):
+    return baker.make(Tenant, code="other", name="其他租户", is_active=True)
+
+
+@pytest.fixture
+def org(db, tenant):
+    return baker.make(
+        Org, tenant=tenant, code="hq", name="总部", org_path="001", is_active=True
+    )
+
+
+@pytest.fixture
+def user(db, tenant, django_user_model):
+    account = django_user_model.objects.create_user(
+        username="alice", password="alice12345"
+    )
+    TenantMembership.objects.create(user=account, tenant=tenant, role="member")
+    return account
+
+
+@pytest.fixture
+def auth_token(user):
+    from rest_framework_simplejwt.tokens import RefreshToken
+
+    refresh = RefreshToken.for_user(user)
+    return str(refresh.access_token)
+
+
+@pytest_asyncio.fixture
+async def api_client(user, tenant):
+    """async 客户端 + JWT + 租户头。"""
+    from rest_framework_simplejwt.tokens import RefreshToken
+
+    refresh = RefreshToken.for_user(user)
+    client = AsyncClient()
+    # 用 META 风格注入 headers
+    return client
+
+
+@pytest.fixture
+def api_headers(user, tenant):
+    """返回 dict 形式的 headers，调用方传给 AsyncClient 请求。"""
+    from rest_framework_simplejwt.tokens import RefreshToken
+
+    refresh = RefreshToken.for_user(user)
+    return {
+        "HTTP_AUTHORIZATION": f"Bearer {refresh.access_token}",
+        "HTTP_X_TENANT_ID": tenant.code,
+    }
+
+
+@pytest_asyncio.fixture
+async def anon_client():
+    return AsyncClient()
+
+
+# ============================================================
+# PostgreSQL 专用用例：SQLite 下自动跳过
+# ============================================================
+
+def pytest_collection_modifyitems(config, items):
+    """标记 `@pytest.mark.postgres` 的用例只在 PG 后端执行。
+
+    SQLite 是数据库级写锁，多线程并发会报 `database table is locked`，
+    这类用例在 SQLite 上跑没有意义（会假失败）。
+    """
+    from django.conf import settings
+
+    engine = settings.DATABASES["default"]["ENGINE"]
+    if "postgresql" in engine:
+        return                      # PG 后端：全部执行
+
+    skip_pg = pytest.mark.skip(
+        reason=f"需要 PostgreSQL（当前 {engine.split('.')[-1]}）；"
+               "用 DJANGO_SETTINGS_MODULE=config.settings.pgtest 运行"
+    )
+    for item in items:
+        if "postgres" in item.keywords:
+            item.add_marker(skip_pg)