feat: support to adjust writing style (#290)

* feat: implment backend for adjust report style

* feat: add web part

* fix test cases

* fix: fix typing

---------

Co-authored-by: Henry Li <henry1943@163.com>

src/server/chat_request.py

@@ -6,6 +6,7 @@ from typing import List, Optional, Union
 from pydantic import BaseModel, Field
 
 from src.rag.retriever import Resource
+from src.config.report_style import ReportStyle
 
 
 class ContentItem(BaseModel):
@@ -58,6 +59,9 @@ class ChatRequest(BaseModel):
     enable_background_investigation: Optional[bool] = Field(
         True, description="Whether to get background investigation before plan"
     )
+    report_style: Optional[ReportStyle] = Field(
+        ReportStyle.ACADEMIC, description="The style of the report"
+    )
 
 
 class TTSRequest(BaseModel):