fix: preserve agent debug conversation context

ai_knowledge_base_v2/apps/backend/app/schemas/admin.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from datetime import datetime
+from typing import Literal
 
 from pydantic import BaseModel, Field
 
@@ -77,12 +78,18 @@ class PromptSaveRequest(BaseModel):
     promptContent: str = Field(min_length=1)
 
 
+class AgentDebugHistoryMessage(BaseModel):
+    role: Literal["user", "assistant"]
+    content: str = Field(min_length=1, max_length=20000)
+
+
 class AgentDebugRequest(BaseModel):
     promptContent: str = Field(min_length=1)
     modelId: int = Field(gt=0)
     knowledgeIds: list[int] = Field(default_factory=list)
     knowledgeVersions: dict[int, int] = Field(default_factory=dict)
     question: str = Field(min_length=1, max_length=2000)
+    history: list[AgentDebugHistoryMessage] = Field(default_factory=list, max_length=100)
     temperature: float | None = Field(default=None, ge=0, le=2)
     topP: float | None = Field(default=None, ge=0, le=1)
     topK: int | None = Field(default=None, ge=1, le=1000)