feat(chat): refactor chat message handling and introduce private messaging support

- Updated `uni_message_sender.py` to allow for private messaging by removing the mandatory group ID and adding user ID handling.
- Enhanced chat history retrieval and clearing functions in `routes.py` and `service.py` to support both group and private chat scenarios.
- Introduced a new `ChatScrollContext` for managing message scrolling and highlighting in the chat UI.
- Created a `ListItemEditorHookFactory` for rendering a rich UI editor for list items in configuration settings, replacing the previous JSON text display.
- Improved message serialization for consistent display in chat history.
- Added detailed logging for chat history operations and error handling.

Co-authored-by: Copilot <copilot@github.com>

dashboard/src/routes/config/bot/hooks/JsonFieldHookFactory.tsx

@@ -67,7 +67,7 @@ export function createJsonFieldHook(options: JsonFieldHookOptions): FieldHookCom
         <div className="space-y-1">
           <h3 className="text-base font-semibold">{label}</h3>
           {description && (
-            <p className="text-sm text-muted-foreground">{description}</p>
+            <p className="text-sm text-muted-foreground whitespace-pre-line">{description}</p>
           )}
           <p className="text-xs text-muted-foreground">{options.helperText}</p>
         </div>