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>

app/exceptions/base.py

@@ -39,8 +39,6 @@ class WizamartException(Exception):
         return result
 
 
-
-
 class ValidationException(WizamartException):
     """Raised when request validation fails."""
 
@@ -62,8 +60,6 @@ class ValidationException(WizamartException):
         )
 
 
-
-
 class AuthenticationException(WizamartException):
     """Raised when authentication fails."""
 
@@ -97,6 +93,7 @@ class AuthorizationException(WizamartException):
             details=details,
         )
 
+
 class ResourceNotFoundException(WizamartException):
     """Raised when a requested resource is not found."""
 
@@ -122,6 +119,7 @@ class ResourceNotFoundException(WizamartException):
             },
         )
 
+
 class ConflictException(WizamartException):
     """Raised when a resource conflict occurs."""
 
@@ -138,6 +136,7 @@ class ConflictException(WizamartException):
             details=details,
         )
 
+
 class BusinessLogicException(WizamartException):
     """Raised when business logic rules are violated."""
 
@@ -196,6 +195,7 @@ class RateLimitException(WizamartException):
             details=rate_limit_details,
         )
 
+
 class ServiceUnavailableException(WizamartException):
     """Raised when service is unavailable."""
 
@@ -206,6 +206,7 @@ class ServiceUnavailableException(WizamartException):
             status_code=503,
         )
 
+
 # Note: Domain-specific exceptions like VendorNotFoundException, UserNotFoundException, etc.
 # are defined in their respective domain modules (vendor.py, admin.py, etc.)
 # to keep domain-specific logic separate from base exceptions.