[moz] fix(test): 修复 integration/e2e 测试 sys.path 污染导致 CI 失败

根因：4 个测试文件在模块级别执行 sys.path.insert(0, DEPLOY_DIR)，
即使测试被 deselect/conftest 跳过，模块仍被 import 触发 sys.path 污染。
后续测试 import src 时从安装目录加载（缺少新增模块如 algorithms/）。

修复：在 sys.path 操作前加 allow_module_level skip guard，
未设置 RUN_INTEGRATION 时跳过整个模块，不执行任何模块级代码。

影响文件：
- tests/integration/test_e2e_api_s1_s8.py
- tests/e2e/test_e2e_stress.py
- tests/e2e/test_e2e_scenarios.py
- tests/e2e/test_e2e_v27.py

tests/e2e/test_e2e_scenarios.py

@@ -6,8 +6,14 @@
 需要 RUN_INTEGRATION=1 + 生产 daemon 运行。
 """
 
-import json
 import os
+
+import pytest
+
+if not os.environ.get("RUN_INTEGRATION"):
+    pytest.skip("E2E tests require RUN_INTEGRATION=1", allow_module_level=True)
+
+import json
 import re
 import sqlite3
 import sys
@@ -17,7 +23,6 @@ from datetime import datetime, timedelta
 from pathlib import Path
 from typing import Any, Dict
 
-import pytest
 import requests as http_requests
 
 # 指向部署目录

tests/e2e/test_e2e_stress.py

@@ -4,15 +4,20 @@
 需要 RUN_INTEGRATION=1 + 生产 daemon 运行。
 """
 
-import json
 import os
+
+import pytest
+
+if not os.environ.get("RUN_INTEGRATION"):
+    pytest.skip("E2E tests require RUN_INTEGRATION=1", allow_module_level=True)
+
+import json
 import sys
 import time
 import uuid
 from pathlib import Path
 from typing import Any, Dict, List
 
-import pytest
 import requests as http_requests
 
 # 指向部署目录

tests/e2e/test_e2e_v27.py

@@ -1,11 +1,8 @@
 import pytest
+import os
 
-skip_no_integration = pytest.mark.skipif(
-    not __import__("os").environ.get("RUN_INTEGRATION"),
-    reason="Set RUN_INTEGRATION=1 to run E2E tests against real daemon",
-)
-
-pytestmark = [pytest.mark.e2e, skip_no_integration]
+if not os.environ.get("RUN_INTEGRATION"):
+    pytest.skip("E2E tests require RUN_INTEGRATION=1", allow_module_level=True)
 
 """v2.7 端到端测试 — 全链路真实环境
 
@@ -14,7 +11,6 @@ pytestmark = [pytest.mark.e2e, skip_no_integration]
 
 import asyncio
 import json
-import os
 import sys
 import time
 import uuid
@@ -22,7 +18,6 @@ from datetime import datetime
 from pathlib import Path
 from typing import Any, Dict, List, Optional
 
-import pytest
 from unittest.mock import MagicMock
 from fastapi.testclient import TestClient
 

tests/integration/test_e2e_api_s1_s8.py

@@ -6,14 +6,19 @@
 覆盖：项目管理 → Task CRUD → SubTask → Stage 进度 → 父状态聚合 → 依赖链 → 超时 → Mail
 """
 
-import json
 import os
+
+import pytest
+
+if not os.environ.get("RUN_INTEGRATION"):
+    pytest.skip("Integration tests require RUN_INTEGRATION=1", allow_module_level=True)
+
+import json
 import sys
 import uuid
 from pathlib import Path
 from typing import Any, Dict
 
-import pytest
 from unittest.mock import MagicMock
 from fastapi.testclient import TestClient