refactor: remove backward compatibility layer for permissions

- Delete app/core/permissions.py (VendorPermissions enum, PermissionGroups)
- Update all code to use permission_discovery_service directly:
  - app/api/deps.py: get_user_permissions() uses discovery service
  - app/modules/tenancy/models/vendor.py: get_all_permissions() uses discovery
  - app/modules/tenancy/routes/api/vendor_team.py: use string literals
  - app/modules/tenancy/services/vendor_team_service.py: use discovery service
  - scripts/init_production.py: use discovery service for presets

Permissions are now fully module-driven:
- Each module defines permissions in definition.py
- PermissionDiscoveryService aggregates all permissions
- Role presets reference permission IDs directly

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/modules/tenancy/routes/api/vendor_team.py

@@ -22,7 +22,8 @@ from app.api.deps import (
     require_vendor_permission,
 )
 from app.core.database import get_db
-from app.core.permissions import VendorPermissions
+# Permission IDs are now defined in module definition.py files
+# and discovered by PermissionDiscoveryService
 from app.modules.tenancy.services.vendor_team_service import vendor_team_service
 from models.schema.auth import UserContext
 from app.modules.tenancy.schemas.team import (
@@ -55,7 +56,7 @@ def list_team_members(
     include_inactive: bool = False,
     db: Session = Depends(get_db),
     current_user: UserContext = Depends(
-        require_vendor_permission(VendorPermissions.TEAM_VIEW.value)
+        require_vendor_permission("team.view")
     ),
 ):
     """
@@ -221,7 +222,7 @@ def get_team_member(
     request: Request,
     db: Session = Depends(get_db),
     current_user: UserContext = Depends(
-        require_vendor_permission(VendorPermissions.TEAM_VIEW.value)
+        require_vendor_permission("team.view")
     ),
 ):
     """
@@ -370,7 +371,7 @@ def list_roles(
     request: Request,
     db: Session = Depends(get_db),
     current_user: UserContext = Depends(
-        require_vendor_permission(VendorPermissions.TEAM_VIEW.value)
+        require_vendor_permission("team.view")
     ),
 ):
     """
@@ -439,7 +440,7 @@ def get_team_statistics(
     request: Request,
     db: Session = Depends(get_db),
     current_user: UserContext = Depends(
-        require_vendor_permission(VendorPermissions.TEAM_VIEW.value)
+        require_vendor_permission("team.view")
     ),
 ):
     """