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/admin.py

@@ -4,12 +4,9 @@ Admin operations specific exceptions.
 """
 
 from typing import Any, Dict, Optional
-from .base import (
-    ResourceNotFoundException,
-    BusinessLogicException,
-    AuthorizationException,
-    ValidationException
-)
+
+from .base import (AuthorizationException, BusinessLogicException,
+                   ResourceNotFoundException, ValidationException)
 
 
 class UserNotFoundException(ResourceNotFoundException):
@@ -35,11 +32,11 @@ class UserStatusChangeException(BusinessLogicException):
     """Raised when user status cannot be changed."""
 
     def __init__(
-            self,
-            user_id: int,
-            current_status: str,
-            attempted_action: str,
-            reason: Optional[str] = None,
+        self,
+        user_id: int,
+        current_status: str,
+        attempted_action: str,
+        reason: Optional[str] = None,
     ):
         message = f"Cannot {attempted_action} user {user_id} (current status: {current_status})"
         if reason:
@@ -61,10 +58,10 @@ class ShopVerificationException(BusinessLogicException):
     """Raised when shop verification fails."""
 
     def __init__(
-            self,
-            shop_id: int,
-            reason: str,
-            current_verification_status: Optional[bool] = None,
+        self,
+        shop_id: int,
+        reason: str,
+        current_verification_status: Optional[bool] = None,
     ):
         details = {
             "shop_id": shop_id,
@@ -85,11 +82,11 @@ class AdminOperationException(BusinessLogicException):
     """Raised when admin operation fails."""
 
     def __init__(
-            self,
-            operation: str,
-            reason: str,
-            target_type: Optional[str] = None,
-            target_id: Optional[str] = None,
+        self,
+        operation: str,
+        reason: str,
+        target_type: Optional[str] = None,
+        target_id: Optional[str] = None,
     ):
         message = f"Admin operation '{operation}' failed: {reason}"
 
@@ -142,10 +139,10 @@ class InvalidAdminActionException(ValidationException):
     """Raised when admin action is invalid."""
 
     def __init__(
-            self,
-            action: str,
-            reason: str,
-            valid_actions: Optional[list] = None,
+        self,
+        action: str,
+        reason: str,
+        valid_actions: Optional[list] = None,
     ):
         details = {
             "action": action,
@@ -166,11 +163,11 @@ class BulkOperationException(BusinessLogicException):
     """Raised when bulk admin operation fails."""
 
     def __init__(
-            self,
-            operation: str,
-            total_items: int,
-            failed_items: int,
-            errors: Optional[Dict[str, Any]] = None,
+        self,
+        operation: str,
+        total_items: int,
+        failed_items: int,
+        errors: Optional[Dict[str, Any]] = None,
     ):
         message = f"Bulk {operation} completed with errors: {failed_items}/{total_items} failed"
 
@@ -195,10 +192,10 @@ class ConfirmationRequiredException(BusinessLogicException):
     """Raised when a destructive operation requires explicit confirmation."""
 
     def __init__(
-            self,
-            operation: str,
-            message: Optional[str] = None,
-            confirmation_param: str = "confirm"
+        self,
+        operation: str,
+        message: Optional[str] = None,
+        confirmation_param: str = "confirm",
     ):
         if not message:
             message = f"Operation '{operation}' requires confirmation parameter: {confirmation_param}=true"
@@ -217,10 +214,10 @@ class VendorVerificationException(BusinessLogicException):
     """Raised when vendor verification fails."""
 
     def __init__(
-            self,
-            vendor_id: int,
-            reason: str,
-            current_verification_status: Optional[bool] = None,
+        self,
+        vendor_id: int,
+        reason: str,
+        current_verification_status: Optional[bool] = None,
     ):
         details = {
             "vendor_id": vendor_id,