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/api/v1/vendor/team.py

@@ -11,25 +11,34 @@ Implements complete team management with:
 """
 
 import logging
-from typing import List
 
 from fastapi import APIRouter, Depends, Request
 from sqlalchemy.orm import Session
 
-from app.api.deps import (get_current_vendor_api, get_user_permissions,
-                          require_vendor_owner, require_vendor_permission)
+from app.api.deps import (
+    get_current_vendor_api,
+    get_user_permissions,
+    require_vendor_owner,
+    require_vendor_permission,
+)
 from app.core.database import get_db
 from app.core.permissions import VendorPermissions
 from app.services.vendor_team_service import vendor_team_service
 from models.database.user import User
-from models.database.vendor import Vendor
-from models.schema.team import (BulkRemoveRequest, BulkRemoveResponse,
-                                InvitationAccept, InvitationAcceptResponse,
-                                InvitationResponse, RoleListResponse,
-                                RoleResponse, TeamMemberInvite,
-                                TeamMemberListResponse, TeamMemberResponse,
-                                TeamMemberUpdate, TeamStatistics,
-                                UserPermissionsResponse)
+from models.schema.team import (
+    BulkRemoveRequest,
+    BulkRemoveResponse,
+    InvitationAccept,
+    InvitationAcceptResponse,
+    InvitationResponse,
+    RoleListResponse,
+    TeamMemberInvite,
+    TeamMemberListResponse,
+    TeamMemberResponse,
+    TeamMemberUpdate,
+    TeamStatistics,
+    UserPermissionsResponse,
+)
 
 router = APIRouter(prefix="/team")
 logger = logging.getLogger(__name__)
@@ -382,7 +391,7 @@ def list_roles(
 @router.get("/me/permissions", response_model=UserPermissionsResponse)
 def get_my_permissions(
     request: Request,
-    permissions: List[str] = Depends(get_user_permissions),
+    permissions: list[str] = Depends(get_user_permissions),
     current_user: User = Depends(get_current_vendor_api),
 ):
     """