style: apply black and isort formatting across entire codebase

- Standardize quote style (single to double quotes)
- Reorder and group imports alphabetically
- Fix line breaks and indentation for consistency
- Apply PEP 8 formatting standards

Also updated Makefile to exclude both venv and .venv from code quality checks.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

tests/unit/middleware/test_theme_context.py

@@ -11,15 +11,14 @@ Tests cover:
 - Edge cases and error handling
 """
 
+from unittest.mock import AsyncMock, MagicMock, Mock, patch
+
 import pytest
-from unittest.mock import Mock, AsyncMock, MagicMock, patch
 from fastapi import Request
 
-from middleware.theme_context import (
-    ThemeContextManager,
-    ThemeContextMiddleware,
-    get_current_theme,
-)
+from middleware.theme_context import (ThemeContextManager,
+                                      ThemeContextMiddleware,
+                                      get_current_theme)
 
 
 @pytest.mark.unit
@@ -42,7 +41,14 @@ class TestThemeContextManager:
         """Test default theme has all required colors."""
         theme = ThemeContextManager.get_default_theme()
 
-        required_colors = ["primary", "secondary", "accent", "background", "text", "border"]
+        required_colors = [
+            "primary",
+            "secondary",
+            "accent",
+            "background",
+            "text",
+            "border",
+        ]
         for color in required_colors:
             assert color in theme["colors"]
             assert theme["colors"][color].startswith("#")
@@ -79,10 +85,7 @@ class TestThemeContextManager:
         mock_theme = Mock()
 
         # Mock to_dict to return actual dictionary
-        custom_theme_dict = {
-            "theme_name": "custom",
-            "colors": {"primary": "#ff0000"}
-        }
+        custom_theme_dict = {"theme_name": "custom", "colors": {"primary": "#ff0000"}}
         mock_theme.to_dict.return_value = custom_theme_dict
 
         # Correct filter chain: query().filter().first()
@@ -141,8 +144,11 @@ class TestThemeContextMiddleware:
         mock_db = MagicMock()
         mock_theme = {"theme_name": "test_theme"}
 
-        with patch('middleware.theme_context.get_db', return_value=iter([mock_db])), \
-             patch.object(ThemeContextManager, 'get_vendor_theme', return_value=mock_theme):
+        with patch(
+            "middleware.theme_context.get_db", return_value=iter([mock_db])
+        ), patch.object(
+            ThemeContextManager, "get_vendor_theme", return_value=mock_theme
+        ):
 
             await middleware.dispatch(request, call_next)
 
@@ -161,7 +167,7 @@ class TestThemeContextMiddleware:
 
         await middleware.dispatch(request, call_next)
 
-        assert hasattr(request.state, 'theme')
+        assert hasattr(request.state, "theme")
         assert request.state.theme["theme_name"] == "default"
         call_next.assert_called_once()
 
@@ -178,8 +184,11 @@ class TestThemeContextMiddleware:
 
         mock_db = MagicMock()
 
-        with patch('middleware.theme_context.get_db', return_value=iter([mock_db])), \
-             patch.object(ThemeContextManager, 'get_vendor_theme', side_effect=Exception("DB Error")):
+        with patch(
+            "middleware.theme_context.get_db", return_value=iter([mock_db])
+        ), patch.object(
+            ThemeContextManager, "get_vendor_theme", side_effect=Exception("DB Error")
+        ):
 
             await middleware.dispatch(request, call_next)
 
@@ -224,7 +233,7 @@ class TestThemeEdgeCases:
 
         mock_db = MagicMock()
 
-        with patch('middleware.theme_context.get_db', return_value=iter([mock_db])):
+        with patch("middleware.theme_context.get_db", return_value=iter([mock_db])):
             await middleware.dispatch(request, call_next)
 
         # Verify database was closed