refactor: 重构 AgentScope 运行时模块并优化前端附件展示

backend/src/schemas/messages/chat_message.py

@@ -4,11 +4,21 @@ from typing import ClassVar
 
 from pydantic import BaseModel, ConfigDict
 
+from ..agent import AgentType, ToolAgentOutput, WorkerAgentOutput
+
+
+class UserMessageAttachments(BaseModel):
+    model_config: ClassVar[ConfigDict] = ConfigDict(extra="allow")
+
+    bucket: str
+    path: str
+    mime_type: str
+
 
 class AgentChatMessageMetadata(BaseModel):
     model_config: ClassVar[ConfigDict] = ConfigDict(extra="allow")
 
-    run_id: str | None = None
-    stage: str | None = None
-    latency_ms: int | None = None
-    message_id: str | None = None
+    agent_type: AgentType | None = None
+    user_message_attachments: UserMessageAttachments | None = None
+    tool_agent_output: ToolAgentOutput | None = None
+    worker_agent_output: WorkerAgentOutput | None = None