feat: comprehensive test infrastructure improvements

- Fix unit test imports: add env setup in conftest.py before module imports
- Add 24 new auth router tests (RBAC, preferences, password validation)
- Add 16 new tests for litellm and chat_summary routers
- Apply black formatting and ruff linting across codebase
- Add pre-commit hooks configuration (black, ruff, file checks)
- Increase CI coverage threshold from 40% to 50%

Test Results:
- 206 tests passing (91 unit + 115 integration)
- Coverage: 58.79% on core modules
- auth.py: 57% → 85%, litellm.py: 23% → 87%, chat_summary.py: 41% → 100%
- auth_service: 96.51%, config: 100%, rbac: 93.48%

dashboard/backend/tests/integration/test_docker.py

@@ -1,8 +1,8 @@
 """
 Integration tests for Docker operations.
 """
+
 import pytest
-from unittest.mock import Mock, patch
 
 
 class TestDockerContainerList:
@@ -35,10 +35,7 @@ class TestDockerContainerActions:
         """Test starting a container."""
         container_id = "abc123"
 
-        response = test_app.post(
-            f"/api/docker/containers/{container_id}/start",
-            headers=admin_headers
-        )
+        response = test_app.post(f"/api/docker/containers/{container_id}/start", headers=admin_headers)
 
         assert response.status_code == 200
         data = response.json()
@@ -48,10 +45,7 @@ class TestDockerContainerActions:
         """Test stopping a container."""
         container_id = "abc123"
 
-        response = test_app.post(
-            f"/api/docker/containers/{container_id}/stop",
-            headers=admin_headers
-        )
+        response = test_app.post(f"/api/docker/containers/{container_id}/stop", headers=admin_headers)
 
         assert response.status_code == 200
 
@@ -59,10 +53,7 @@ class TestDockerContainerActions:
         """Test restarting a container."""
         container_id = "abc123"
 
-        response = test_app.post(
-            f"/api/docker/containers/{container_id}/restart",
-            headers=admin_headers
-        )
+        response = test_app.post(f"/api/docker/containers/{container_id}/restart", headers=admin_headers)
 
         assert response.status_code == 200
 
@@ -74,10 +65,7 @@ class TestDockerContainerActions:
 
     def test_container_action_invalid_action(self, test_app, admin_headers):
         """Test container action with invalid action."""
-        response = test_app.post(
-            "/api/docker/containers/abc123/invalid_action",
-            headers=admin_headers
-        )
+        response = test_app.post("/api/docker/containers/abc123/invalid_action", headers=admin_headers)
 
         assert response.status_code == 400
         data = response.json()
@@ -91,10 +79,7 @@ class TestDockerContainerLogs:
         """Test getting container logs."""
         container_id = "abc123"
 
-        response = test_app.get(
-            f"/api/docker/containers/{container_id}/logs",
-            headers=admin_headers
-        )
+        response = test_app.get(f"/api/docker/containers/{container_id}/logs", headers=admin_headers)
 
         assert response.status_code == 200
         data = response.json()
@@ -104,10 +89,7 @@ class TestDockerContainerLogs:
         """Test getting container logs with tail limit."""
         container_id = "abc123"
 
-        response = test_app.get(
-            f"/api/docker/containers/{container_id}/logs?tail=100",
-            headers=admin_headers
-        )
+        response = test_app.get(f"/api/docker/containers/{container_id}/logs?tail=100", headers=admin_headers)
 
         assert response.status_code == 200
 
@@ -122,10 +104,7 @@ class TestDockerContainerLogs:
         # Note: In this test setup, the mock always returns a container
         # Testing actual error handling would require a different approach
         # For now, verify the endpoint works with the mock
-        response = test_app.get(
-            "/api/docker/containers/nonexistent/logs",
-            headers=admin_headers
-        )
+        response = test_app.get("/api/docker/containers/nonexistent/logs", headers=admin_headers)
 
         # With the current mock setup, this will succeed
         assert response.status_code == 200
@@ -137,12 +116,11 @@ class TestDockerPermissions:
     @pytest.fixture
     def member_token(self, mock_config, temp_auth_file, temp_rbac_file):
         """Create token for member role."""
-        from auth_service import create_access_token
         from datetime import timedelta
-        return create_access_token(
-            data={"sub": "memberuser", "role": "member"},
-            expires_delta=timedelta(minutes=30)
-        )
+
+        from auth_service import create_access_token
+
+        return create_access_token(data={"sub": "memberuser", "role": "member"}, expires_delta=timedelta(minutes=30))
 
     @pytest.fixture
     def member_headers(self, member_token):
@@ -158,22 +136,19 @@ class TestDockerPermissions:
 
     def test_member_cannot_start_container(self, test_app, member_headers):
         """Test that member cannot start containers (admin only)."""
-        response = test_app.post(
-            "/api/docker/containers/abc123/start",
-            headers=member_headers
-        )
+        response = test_app.post("/api/docker/containers/abc123/start", headers=member_headers)
 
         # Should be forbidden for non-admin
         assert response.status_code == 403
 
     def test_viewer_can_list_containers(self, test_app, mock_config, temp_auth_file, temp_rbac_file):
         """Test that viewer can list containers if they have docker page access."""
-        from auth_service import create_access_token
         from datetime import timedelta
 
+        from auth_service import create_access_token
+
         viewer_token = create_access_token(
-            data={"sub": "vieweruser", "role": "viewer"},
-            expires_delta=timedelta(minutes=30)
+            data={"sub": "vieweruser", "role": "viewer"}, expires_delta=timedelta(minutes=30)
         )
         headers = {"Authorization": f"Bearer {viewer_token}"}