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/services/test_auth_service.py

@@ -1,11 +1,9 @@
 # tests/test_auth_service.py
 import pytest
 
-from app.exceptions.auth import (
-    UserAlreadyExistsException,
-    InvalidCredentialsException,
-    UserNotActiveException,
-)
+from app.exceptions.auth import (InvalidCredentialsException,
+                                 UserAlreadyExistsException,
+                                 UserNotActiveException)
 from app.exceptions.base import ValidationException
 from app.services.auth_service import AuthService
 from models.schema.auth import UserLogin, UserRegister
@@ -218,11 +216,14 @@ class TestAuthService:
 
     def test_create_access_token_failure(self, test_user, monkeypatch):
         """Test creating access token handles failures"""
+
         # Mock the auth_manager to raise an exception
         def mock_create_token(*args, **kwargs):
             raise Exception("Token creation failed")
 
-        monkeypatch.setattr(self.service.auth_manager, "create_access_token", mock_create_token)
+        monkeypatch.setattr(
+            self.service.auth_manager, "create_access_token", mock_create_token
+        )
 
         with pytest.raises(ValidationException) as exc_info:
             self.service.create_access_token(test_user)
@@ -250,11 +251,14 @@ class TestAuthService:
 
     def test_hash_password_failure(self, monkeypatch):
         """Test password hashing handles failures"""
+
         # Mock the auth_manager to raise an exception
         def mock_hash_password(*args, **kwargs):
             raise Exception("Hashing failed")
 
-        monkeypatch.setattr(self.service.auth_manager, "hash_password", mock_hash_password)
+        monkeypatch.setattr(
+            self.service.auth_manager, "hash_password", mock_hash_password
+        )
 
         with pytest.raises(ValidationException) as exc_info:
             self.service.hash_password("testpassword")
@@ -267,9 +271,7 @@ class TestAuthService:
     def test_register_user_database_error(self, db_with_error):
         """Test user registration handles database errors"""
         user_data = UserRegister(
-            email="test@example.com",
-            username="testuser",
-            password="password123"
+            email="test@example.com", username="testuser", password="password123"
         )
 
         with pytest.raises(ValidationException) as exc_info: