fix: use allow_unencrypted_storage for headless Linux token cache

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

graph_client.py

@@ -10,7 +10,7 @@ from database import get_setting, set_setting
 logger = logging.getLogger(__name__)
 
 CACHE_OPTIONS = TokenCachePersistenceOptions(
-    name="busylight", allow_unencrypted_cache=True
+    name="busylight", allow_unencrypted_storage=True
 )
 
 
@@ -35,8 +35,6 @@ class GraphAPI:
             self.credential = DeviceCodeCredential(
                 client_id=client_id,
                 tenant_id=tenant_id,
-                enable_persistent_cache=True,
-                allow_unencrypted_cache=True,
                 cache_persistence_options=CACHE_OPTIONS,
                 authentication_record=record,
             )
@@ -59,8 +57,6 @@ class GraphAPI:
         self.credential = DeviceCodeCredential(
             client_id=client_id,
             tenant_id=tenant_id,
-            enable_persistent_cache=True,
-            allow_unencrypted_cache=True,
             cache_persistence_options=CACHE_OPTIONS,
         )
         record = self.credential.authenticate(tenant_id=tenant_id, scopes=scopes)