Add optional permission scopes to API tokens

A token may carry a scopes list: it then grants only those permissions,
intersected with what the owner holds at use time, with the admin role
bypass suspended and role-gated routes denied - a scoped token from an
admin account is genuinely limited. Scope ceiling enforced at
create/update too (only permissions the owner holds; 400 lists
violations) and the picker only offers what you hold. Token management
itself now requires the new apitokens.create permission (admin by
default, grantable via roles). Unscoped tokens keep the exact prior
act-as-owner behavior; imports need an unscoped admin token.
Migration 7d22.

756 tests pass; live-verified scoped 201/403 matrix.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

shopdb/utils/import_mode.py

@@ -16,7 +16,7 @@ regular users. See docs/IMPORT-API.md for the operator manual.
 from datetime import datetime, timezone
 
 from flask import request
-from flask_jwt_extended import verify_jwt_in_request, current_user
+from flask_jwt_extended import verify_jwt_in_request, current_user, get_jwt
 
 
 # Request header a migration client sets to opt a request into import mode.
@@ -48,7 +48,14 @@ def import_mode_active():
         return False
     verify_jwt_in_request(optional=True)
     user = current_user
-    return bool(user is not None and user.hasrole('admin'))
+    if user is None or not user.hasrole('admin'):
+        return False
+    # A scoped PAT never gets import mode: import mode is an admin-role
+    # capability and a scoped token suspends the admin bypass. get_jwt is safe
+    # here - an admin user means a valid JWT was decoded above.
+    if get_jwt().get('patscopes') is not None:
+        return False
+    return True
 
 
 def parse_import_datetime(value):