first commit

src/schemas/chat.py

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+from pydantic import BaseModel, Field
+from typing import Optional, List, Dict, Any
+
+
+class ChatRequest(BaseModel):
+    message: str = Field(..., description="用户的输入指令")
+    thread_id: Optional[str] = Field(None, description="会话线程ID，不传则开启新会话")
+    checkpoint_id: Optional[str] = Field(None, description="回溯点的ID，用于从历史点开启新对话")
+
+
+class HistoryItem(BaseModel):
+    checkpoint_id: str
+    last_message: str
+    node: Optional[str]
+    timestamp: Any
+
+
+class HistoryResponse(BaseModel):
+    thread_id: str
+    history: List[HistoryItem]
+
+
+class StreamChunk(BaseModel):
+    node: str
+    content: str
+    checkpoint_id: str