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chat.py

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+from fastapi import APIRouter, HTTPException
+from app.models.schemas import ChatRequest, ChatResponse
+from app.services.gigachat import call_gigachat
+
+router = APIRouter()
+
+@router.post("/chat", response_model=ChatResponse)
+async def chat_endpoint(payload: ChatRequest):
+    try:
+        reply = await call_gigachat(payload.message, payload.agent.value)
+        return ChatResponse(reply=reply, agent_used=payload.agent.value)
+    except Exception as exc:
+        raise HTTPException(status_code=502, detail=f"GigaChat error: {str(exc)}")