Merge branch 'zhujingyi' into 'master'

'feat:智能体暗色模式样式修改'

See merge request knowledge-base-bj/deerflow-server!72

offline-backend-20260512/backend/config.yaml

@@ -147,14 +147,14 @@ agents_api:
   enabled: true
 
 database:
-  backend: mysql
-  mysql_url: $MYSQL_DATABASE_URL
+  backend: sqlite
+  sqlite_dir: .deer-flow/data
   pool_size: 10
   echo_sql: false
 
 checkpointer:
   type: sqlite
-  connection_string: D:\cursor-work\offline-backend-20260512\backend\.deer-flow\data\deerflow.db
+  connection_string: D:\05271502\deerflow-server\offline-backend-20260512\backend\.deer-flow\data\deerflow.db
 
 # 记忆子系统:跨会话持久化用户画像与 agent 私有记忆。
 # 三层覆盖优先级(高->低):