refactor: 重构聊天模块支持 SSE 断线重连及用户上下文隔离

backend/src/schemas/agent/__init__.py

@@ -14,13 +14,11 @@ from schemas.agent.runtime_models import (
     ResultTyping,
     ResultType,
     RouterAgentOutput,
-    RouterUiDecision,
     RunStatus,
     TaskType,
     TaskTyping,
     ToolAgentOutput,
     ToolStatus,
-    UiMode,
     WorkerAgentOutputLite,
     WorkerAgentOutputRich,
     resolve_worker_output_model,
@@ -47,7 +45,6 @@ __all__ = [
     "ClientTimeContext",
     "ResultType",
     "RouterAgentOutput",
-    "RouterUiDecision",
     "RunStatus",
     "RuntimeMode",
     "TaskType",
@@ -56,7 +53,6 @@ __all__ = [
     "SystemVisibilityBit",
     "ToolAgentOutput",
     "ToolStatus",
-    "UiMode",
     "UiHintAction",
     "UiHintIntent",
     "UiHintSection",