refactor: modernize code quality tooling with Ruff

- Replace black, isort, and flake8 with Ruff (all-in-one linter and formatter)
- Add comprehensive pyproject.toml configuration
- Simplify Makefile code quality targets
- Configure exclusions for venv/.venv in pyproject.toml
- Auto-fix 1,359 linting issues across codebase

Benefits:
- Much faster builds (Ruff is written in Rust)
- Single tool replaces multiple tools
- More comprehensive rule set (UP, B, C4, SIM, PIE, RET, Q)
- All configuration centralized in pyproject.toml
- Better import sorting and formatting consistency

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/core/permissions.py

@@ -7,8 +7,8 @@ This module defines:
 - Permission groups (for easier role creation)
 - Permission checking utilities
 """
+
 from enum import Enum
-from typing import List, Set
 
 
 class VendorPermissions(str, Enum):
@@ -78,10 +78,10 @@ class PermissionGroups:
     """Pre-defined permission groups for common roles."""
 
     # Full access (for owners)
-    OWNER: Set[str] = set(p.value for p in VendorPermissions)
+    OWNER: set[str] = set(p.value for p in VendorPermissions)
 
     # Manager - Can do most things except team management and critical settings
-    MANAGER: Set[str] = {
+    MANAGER: set[str] = {
         VendorPermissions.DASHBOARD_VIEW.value,
         VendorPermissions.PRODUCTS_VIEW.value,
         VendorPermissions.PRODUCTS_CREATE.value,
@@ -113,7 +113,7 @@ class PermissionGroups:
     }
 
     # Staff - Can view and edit products/orders but limited access
-    STAFF: Set[str] = {
+    STAFF: set[str] = {
         VendorPermissions.DASHBOARD_VIEW.value,
         VendorPermissions.PRODUCTS_VIEW.value,
         VendorPermissions.PRODUCTS_CREATE.value,
@@ -127,7 +127,7 @@ class PermissionGroups:
     }
 
     # Support - Can view and assist with orders/customers
-    SUPPORT: Set[str] = {
+    SUPPORT: set[str] = {
         VendorPermissions.DASHBOARD_VIEW.value,
         VendorPermissions.PRODUCTS_VIEW.value,
         VendorPermissions.ORDERS_VIEW.value,
@@ -137,7 +137,7 @@ class PermissionGroups:
     }
 
     # Viewer - Read-only access
-    VIEWER: Set[str] = {
+    VIEWER: set[str] = {
         VendorPermissions.DASHBOARD_VIEW.value,
         VendorPermissions.PRODUCTS_VIEW.value,
         VendorPermissions.STOCK_VIEW.value,
@@ -147,7 +147,7 @@ class PermissionGroups:
     }
 
     # Marketing - Focused on marketing and customer communication
-    MARKETING: Set[str] = {
+    MARKETING: set[str] = {
         VendorPermissions.DASHBOARD_VIEW.value,
         VendorPermissions.CUSTOMERS_VIEW.value,
         VendorPermissions.CUSTOMERS_EXPORT.value,
@@ -162,34 +162,34 @@ class PermissionChecker:
     """Utility class for permission checking."""
 
     @staticmethod
-    def has_permission(permissions: List[str], required_permission: str) -> bool:
+    def has_permission(permissions: list[str], required_permission: str) -> bool:
         """Check if a permission list contains a required permission."""
         return required_permission in permissions
 
     @staticmethod
     def has_any_permission(
-        permissions: List[str], required_permissions: List[str]
+        permissions: list[str], required_permissions: list[str]
     ) -> bool:
         """Check if a permission list contains ANY of the required permissions."""
         return any(perm in permissions for perm in required_permissions)
 
     @staticmethod
     def has_all_permissions(
-        permissions: List[str], required_permissions: List[str]
+        permissions: list[str], required_permissions: list[str]
     ) -> bool:
         """Check if a permission list contains ALL of the required permissions."""
         return all(perm in permissions for perm in required_permissions)
 
     @staticmethod
     def get_missing_permissions(
-        permissions: List[str], required_permissions: List[str]
-    ) -> List[str]:
+        permissions: list[str], required_permissions: list[str]
+    ) -> list[str]:
         """Get list of missing permissions."""
         return [perm for perm in required_permissions if perm not in permissions]
 
 
 # Helper function to get permissions for a role preset
-def get_preset_permissions(preset_name: str) -> Set[str]:
+def get_preset_permissions(preset_name: str) -> set[str]:
     """
     Get permissions for a preset role.