feat: add qianfan chat bot

models/bot_factory.py

@@ -21,6 +21,10 @@ def create_bot(bot_type):
         from models.deepseek.deepseek_bot import DeepSeekBot
         return DeepSeekBot()
 
+    elif bot_type == const.QIANFAN:
+        from models.qianfan.qianfan_bot import QianfanBot
+        return QianfanBot()
+
     elif bot_type in (const.OPENAI, const.CHATGPT, const.CUSTOM):  # OpenAI-compatible API
         from models.chatgpt.chat_gpt_bot import ChatGPTBot
         return ChatGPTBot()