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_uploads_manager.py

@@ -0,0 +1,151 @@
+"""Tests for deerflow.uploads.manager — shared upload management logic."""
+
+import pytest
+
+from deerflow.uploads.manager import (
+    PathTraversalError,
+    claim_unique_filename,
+    delete_file_safe,
+    list_files_in_dir,
+    normalize_filename,
+    validate_path_traversal,
+)
+
+# ---------------------------------------------------------------------------
+# normalize_filename
+# ---------------------------------------------------------------------------
+
+
+class TestNormalizeFilename:
+    def test_safe_filename(self):
+        assert normalize_filename("report.pdf") == "report.pdf"
+
+    def test_strips_path_components(self):
+        assert normalize_filename("../../etc/passwd") == "passwd"
+
+    def test_rejects_empty(self):
+        with pytest.raises(ValueError, match="empty"):
+            normalize_filename("")
+
+    def test_rejects_dot_dot(self):
+        with pytest.raises(ValueError, match="unsafe"):
+            normalize_filename("..")
+
+    def test_strips_separators(self):
+        assert normalize_filename("path/to/file.txt") == "file.txt"
+
+    def test_dot_only(self):
+        with pytest.raises(ValueError, match="unsafe"):
+            normalize_filename(".")
+
+
+# ---------------------------------------------------------------------------
+# claim_unique_filename
+# ---------------------------------------------------------------------------
+
+
+class TestDeduplicateFilename:
+    def test_no_collision(self):
+        seen: set[str] = set()
+        assert claim_unique_filename("data.txt", seen) == "data.txt"
+        assert "data.txt" in seen
+
+    def test_single_collision(self):
+        seen = {"data.txt"}
+        assert claim_unique_filename("data.txt", seen) == "data_1.txt"
+        assert "data_1.txt" in seen
+
+    def test_triple_collision(self):
+        seen = {"data.txt", "data_1.txt", "data_2.txt"}
+        assert claim_unique_filename("data.txt", seen) == "data_3.txt"
+        assert "data_3.txt" in seen
+
+    def test_mutates_seen(self):
+        seen: set[str] = set()
+        claim_unique_filename("a.txt", seen)
+        claim_unique_filename("a.txt", seen)
+        assert seen == {"a.txt", "a_1.txt"}
+
+
+# ---------------------------------------------------------------------------
+# validate_path_traversal
+# ---------------------------------------------------------------------------
+
+
+class TestValidatePathTraversal:
+    def test_inside_base_ok(self, tmp_path):
+        child = tmp_path / "file.txt"
+        child.touch()
+        validate_path_traversal(child, tmp_path)  # no exception
+
+    def test_outside_base_raises(self, tmp_path):
+        outside = tmp_path / ".." / "evil.txt"
+        with pytest.raises(PathTraversalError, match="traversal"):
+            validate_path_traversal(outside, tmp_path)
+
+    def test_symlink_escape(self, tmp_path):
+        target = tmp_path.parent / "secret.txt"
+        target.touch()
+        link = tmp_path / "escape"
+        try:
+            link.symlink_to(target)
+        except OSError as exc:
+            if getattr(exc, "winerror", None) == 1314:
+                pytest.skip("symlink creation requires Developer Mode or elevated privileges on Windows")
+            raise
+        with pytest.raises(PathTraversalError, match="traversal"):
+            validate_path_traversal(link, tmp_path)
+
+
+# ---------------------------------------------------------------------------
+# list_files_in_dir
+# ---------------------------------------------------------------------------
+
+
+class TestListFilesInDir:
+    def test_empty_dir(self, tmp_path):
+        result = list_files_in_dir(tmp_path)
+        assert result == {"files": [], "count": 0}
+
+    def test_nonexistent_dir(self, tmp_path):
+        result = list_files_in_dir(tmp_path / "nope")
+        assert result == {"files": [], "count": 0}
+
+    def test_multiple_files_sorted(self, tmp_path):
+        (tmp_path / "b.txt").write_text("b")
+        (tmp_path / "a.txt").write_text("a")
+        result = list_files_in_dir(tmp_path)
+        assert result["count"] == 2
+        assert result["files"][0]["filename"] == "a.txt"
+        assert result["files"][1]["filename"] == "b.txt"
+        for f in result["files"]:
+            assert set(f.keys()) == {"filename", "size", "path", "extension", "modified"}
+
+    def test_ignores_subdirectories(self, tmp_path):
+        (tmp_path / "file.txt").write_text("data")
+        (tmp_path / "subdir").mkdir()
+        result = list_files_in_dir(tmp_path)
+        assert result["count"] == 1
+        assert result["files"][0]["filename"] == "file.txt"
+
+
+# ---------------------------------------------------------------------------
+# delete_file_safe
+# ---------------------------------------------------------------------------
+
+
+class TestDeleteFileSafe:
+    def test_delete_existing_file(self, tmp_path):
+        f = tmp_path / "test.txt"
+        f.write_text("data")
+        result = delete_file_safe(tmp_path, "test.txt")
+        assert result["success"] is True
+        assert not f.exists()
+
+    def test_delete_nonexistent_raises(self, tmp_path):
+        with pytest.raises(FileNotFoundError):
+            delete_file_safe(tmp_path, "nope.txt")
+
+    def test_delete_traversal_raises(self, tmp_path):
+        with pytest.raises(PathTraversalError, match="traversal"):
+            delete_file_safe(tmp_path, "../outside.txt")