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_context.py

@@ -10,16 +10,13 @@ Tests cover:
 - Edge cases and error handling
 """
 
+from unittest.mock import AsyncMock, Mock, patch
+
 import pytest
-from unittest.mock import Mock, AsyncMock, patch
 from fastapi import Request
 
-from middleware.context import (
-    ContextManager,
-    ContextMiddleware,
-    RequestContext,
-    get_request_context,
-)
+from middleware.context import (ContextManager, ContextMiddleware,
+                                RequestContext, get_request_context)
 
 
 @pytest.mark.unit
@@ -321,22 +318,38 @@ class TestContextManagerHelpers:
     def test_is_admin_context_from_subdomain(self):
         """Test _is_admin_context with admin subdomain."""
         request = Mock()
-        assert ContextManager._is_admin_context(request, "admin.platform.com", "/dashboard") is True
+        assert (
+            ContextManager._is_admin_context(
+                request, "admin.platform.com", "/dashboard"
+            )
+            is True
+        )
 
     def test_is_admin_context_from_path(self):
         """Test _is_admin_context with admin path."""
         request = Mock()
-        assert ContextManager._is_admin_context(request, "localhost", "/admin/users") is True
+        assert (
+            ContextManager._is_admin_context(request, "localhost", "/admin/users")
+            is True
+        )
 
     def test_is_admin_context_both(self):
         """Test _is_admin_context with both subdomain and path."""
         request = Mock()
-        assert ContextManager._is_admin_context(request, "admin.platform.com", "/admin/users") is True
+        assert (
+            ContextManager._is_admin_context(
+                request, "admin.platform.com", "/admin/users"
+            )
+            is True
+        )
 
     def test_is_not_admin_context(self):
         """Test _is_admin_context returns False for non-admin."""
         request = Mock()
-        assert ContextManager._is_admin_context(request, "vendor.platform.com", "/shop") is False
+        assert (
+            ContextManager._is_admin_context(request, "vendor.platform.com", "/shop")
+            is False
+        )
 
     def test_is_vendor_dashboard_context(self):
         """Test _is_vendor_dashboard_context with /vendor/ path."""
@@ -344,11 +357,16 @@ class TestContextManagerHelpers:
 
     def test_is_vendor_dashboard_context_nested(self):
         """Test _is_vendor_dashboard_context with nested vendor path."""
-        assert ContextManager._is_vendor_dashboard_context("/vendor/products/list") is True
+        assert (
+            ContextManager._is_vendor_dashboard_context("/vendor/products/list") is True
+        )
 
     def test_is_not_vendor_dashboard_context_vendors_plural(self):
         """Test _is_vendor_dashboard_context excludes /vendors/ path."""
-        assert ContextManager._is_vendor_dashboard_context("/vendors/shop123/products") is False
+        assert (
+            ContextManager._is_vendor_dashboard_context("/vendors/shop123/products")
+            is False
+        )
 
     def test_is_not_vendor_dashboard_context(self):
         """Test _is_vendor_dashboard_context returns False for non-vendor paths."""
@@ -373,7 +391,7 @@ class TestContextMiddleware:
 
         await middleware.dispatch(request, call_next)
 
-        assert hasattr(request.state, 'context_type')
+        assert hasattr(request.state, "context_type")
         assert request.state.context_type == RequestContext.API
         call_next.assert_called_once_with(request)
 
@@ -565,7 +583,7 @@ class TestEdgeCases:
         request.url = Mock(path="/api/vendors")
         request.headers = {"host": "localhost"}
         # No state attribute at all
-        delattr(request, 'state')
+        delattr(request, "state")
 
         # Should still work, falling back to url.path
         with pytest.raises(AttributeError):