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/services/team_service.py

@@ -9,13 +9,12 @@ This module provides:
 """
 
 import logging
-from datetime import datetime, timezone
-from typing import Any, Dict, List
+from datetime import UTC, datetime
+from typing import Any
 
 from sqlalchemy.orm import Session
 
-from app.exceptions import (UnauthorizedVendorAccessException,
-                            ValidationException)
+from app.exceptions import ValidationException
 from models.database.user import User
 from models.database.vendor import Role, VendorUser
 
@@ -27,7 +26,7 @@ class TeamService:
 
     def get_team_members(
         self, db: Session, vendor_id: int, current_user: User
-    ) -> List[Dict[str, Any]]:
+    ) -> list[dict[str, Any]]:
         """
         Get all team members for vendor.
 
@@ -69,7 +68,7 @@ class TeamService:
 
     def invite_team_member(
         self, db: Session, vendor_id: int, invitation_data: dict, current_user: User
-    ) -> Dict[str, Any]:
+    ) -> dict[str, Any]:
         """
         Invite a new team member.
 
@@ -102,7 +101,7 @@ class TeamService:
         user_id: int,
         update_data: dict,
         current_user: User,
-    ) -> Dict[str, Any]:
+    ) -> dict[str, Any]:
         """
         Update team member role or status.
 
@@ -135,7 +134,7 @@ class TeamService:
             if "is_active" in update_data:
                 vendor_user.is_active = update_data["is_active"]
 
-            vendor_user.updated_at = datetime.now(timezone.utc)
+            vendor_user.updated_at = datetime.now(UTC)
             db.commit()
             db.refresh(vendor_user)
 
@@ -178,7 +177,7 @@ class TeamService:
 
             # Soft delete
             vendor_user.is_active = False
-            vendor_user.updated_at = datetime.now(timezone.utc)
+            vendor_user.updated_at = datetime.now(UTC)
             db.commit()
 
             logger.info(f"Removed user {user_id} from vendor {vendor_id}")
@@ -189,7 +188,7 @@ class TeamService:
             logger.error(f"Error removing team member: {str(e)}")
             raise ValidationException("Failed to remove team member")
 
-    def get_vendor_roles(self, db: Session, vendor_id: int) -> List[Dict[str, Any]]:
+    def get_vendor_roles(self, db: Session, vendor_id: int) -> list[dict[str, Any]]:
         """
         Get available roles for vendor.