refactor(tests): reorganize tests into unittest/ and e2e/ directories

- Move all unit tests from tests/ to tests/unittest/
- Add tests/e2e/ directory for end-to-end tests
- Update conftest.py for new test structure
- Add new tests for auth dependencies, policies, route injection
- Add new tests for run callbacks, create store, execution artifacts
- Remove obsolete tests for deleted persistence layer

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/tests/unittest/test_aio_sandbox_local_backend.py

@@ -0,0 +1,28 @@
+from deerflow.community.aio_sandbox.local_backend import _format_container_mount
+
+
+def test_format_container_mount_uses_mount_syntax_for_docker_windows_paths():
+    args = _format_container_mount("docker", "D:/deer-flow/backend/.deer-flow/threads", "/mnt/threads", False)
+
+    assert args == [
+        "--mount",
+        "type=bind,src=D:/deer-flow/backend/.deer-flow/threads,dst=/mnt/threads",
+    ]
+
+
+def test_format_container_mount_marks_docker_readonly_mounts():
+    args = _format_container_mount("docker", "/host/path", "/mnt/path", True)
+
+    assert args == [
+        "--mount",
+        "type=bind,src=/host/path,dst=/mnt/path,readonly",
+    ]
+
+
+def test_format_container_mount_keeps_volume_syntax_for_apple_container():
+    args = _format_container_mount("container", "/host/path", "/mnt/path", True)
+
+    assert args == [
+        "-v",
+        "/host/path:/mnt/path:ro",
+    ]