Revert "feat: configure Kanban login by operator email"

This reverts commit 508fa03664.

local/security_test.py

@@ -28,8 +28,8 @@ def run():
     print('PASS: CSP, frame protection, Host and cross-origin rejection')
 
     operator=Client()
-    credentials={'email':os.environ.get('OPERATOR_EMAIL','operator@example.test'),'password':os.environ.get('OPERATOR_PASSWORD','local-operator-only')}
-    encoded=base64.b64encode((credentials['email']+':'+credentials['password']).encode()).decode()
+    credentials={'username':os.environ.get('OPERATOR_USER','operator'),'password':os.environ.get('OPERATOR_PASSWORD','local-operator-only')}
+    encoded=base64.b64encode((credentials['username']+':'+credentials['password']).encode()).decode()
     raw('/api/operator/board',401,{'Authorization':'Basic '+encoded})
     operator.call('/operator/login',credentials)
     token=next(c for c in operator.jar if c.name=='dtf_operator')
@@ -58,9 +58,9 @@ def run():
     print('PASS: extension allowlist, exact multipart Content-Length signature, pending upload quota')
 
     # Unique identity avoids locking out the real local operator.
-    attacker=Client();email='test-'+uuid4().hex+'@example.test'
-    for _ in range(10):attacker.call('/operator/login',{'email':email,'password':'invalid'},expected=401)
-    attacker.call('/operator/login',{'email':email,'password':'invalid'},expected=429)
+    attacker=Client();username='test-'+uuid4().hex
+    for _ in range(10):attacker.call('/operator/login',{'username':username,'password':'invalid'},expected=401)
+    attacker.call('/operator/login',{'username':username,'password':'invalid'},expected=429)
     print('PASS: operator login throttling (only synthetic account bucket exhausted)')
 
 if __name__=='__main__':run()