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/team.py

@@ -4,13 +4,10 @@ Team management specific exceptions.
 """
 
 from typing import Any, Dict, Optional
-from .base import (
-    ResourceNotFoundException,
-    ConflictException,
-    ValidationException,
-    AuthorizationException,
-    BusinessLogicException
-)
+
+from .base import (AuthorizationException, BusinessLogicException,
+                   ConflictException, ResourceNotFoundException,
+                   ValidationException)
 
 
 class TeamMemberNotFoundException(ResourceNotFoundException):
@@ -20,7 +17,9 @@ class TeamMemberNotFoundException(ResourceNotFoundException):
         details = {"user_id": user_id}
         if vendor_id:
             details["vendor_id"] = vendor_id
-            message = f"Team member with user ID '{user_id}' not found in vendor {vendor_id}"
+            message = (
+                f"Team member with user ID '{user_id}' not found in vendor {vendor_id}"
+            )
         else:
             message = f"Team member with user ID '{user_id}' not found"
 
@@ -84,7 +83,12 @@ class TeamInvitationAlreadyAcceptedException(ConflictException):
 class UnauthorizedTeamActionException(AuthorizationException):
     """Raised when user tries to perform team action without permission."""
 
-    def __init__(self, action: str, user_id: Optional[int] = None, required_permission: Optional[str] = None):
+    def __init__(
+        self,
+        action: str,
+        user_id: Optional[int] = None,
+        required_permission: Optional[str] = None,
+    ):
         details = {"action": action}
         if user_id:
             details["user_id"] = user_id
@@ -147,10 +151,10 @@ class InvalidRoleException(ValidationException):
     """Raised when role data is invalid."""
 
     def __init__(
-            self,
-            message: str = "Invalid role data",
-            field: Optional[str] = None,
-            details: Optional[Dict[str, Any]] = None,
+        self,
+        message: str = "Invalid role data",
+        field: Optional[str] = None,
+        details: Optional[Dict[str, Any]] = None,
     ):
         super().__init__(
             message=message,
@@ -164,10 +168,10 @@ class InsufficientTeamPermissionsException(AuthorizationException):
     """Raised when user lacks required team permissions for an action."""
 
     def __init__(
-            self,
-            required_permission: str,
-            user_id: Optional[int] = None,
-            action: Optional[str] = None,
+        self,
+        required_permission: str,
+        user_id: Optional[int] = None,
+        action: Optional[str] = None,
     ):
         details = {"required_permission": required_permission}
         if user_id:
@@ -202,10 +206,10 @@ class TeamValidationException(ValidationException):
     """Raised when team operation validation fails."""
 
     def __init__(
-            self,
-            message: str = "Team operation validation failed",
-            field: Optional[str] = None,
-            validation_errors: Optional[Dict[str, str]] = None,
+        self,
+        message: str = "Team operation validation failed",
+        field: Optional[str] = None,
+        validation_errors: Optional[Dict[str, str]] = None,
     ):
         details = {}
         if validation_errors:
@@ -223,10 +227,10 @@ class InvalidInvitationDataException(ValidationException):
     """Raised when team invitation data is invalid."""
 
     def __init__(
-            self,
-            message: str = "Invalid invitation data",
-            field: Optional[str] = None,
-            details: Optional[Dict[str, Any]] = None,
+        self,
+        message: str = "Invalid invitation data",
+        field: Optional[str] = None,
+        details: Optional[Dict[str, Any]] = None,
     ):
         super().__init__(
             message=message,
@@ -240,6 +244,7 @@ class InvalidInvitationDataException(ValidationException):
 # NEW: Add InvalidInvitationTokenException
 # ============================================================================
 
+
 class InvalidInvitationTokenException(ValidationException):
     """Raised when invitation token is invalid, expired, or already used.
 
@@ -248,9 +253,9 @@ class InvalidInvitationTokenException(ValidationException):
     """
 
     def __init__(
-            self,
-            message: str = "Invalid or expired invitation token",
-            invitation_token: Optional[str] = None
+        self,
+        message: str = "Invalid or expired invitation token",
+        invitation_token: Optional[str] = None,
     ):
         details = {}
         if invitation_token: