Simplify agent message handling and streaming cleanup

app/agent/prompt/__init__.py

@@ -141,9 +141,6 @@ class PromptManager:
             if caps:
                 markdown_spec = self._generate_formatting_instructions(caps)
         button_choice_spec = self._generate_button_choice_instructions(msg_channel)
-        send_message_format_spec = self._generate_send_message_format_instructions(
-            msg_channel
-        )
 
         # 啰嗦模式
         verbose_spec = ""
@@ -169,7 +166,6 @@ class PromptManager:
             moviepilot_info=moviepilot_info,
             voice_reply_spec=voice_reply_spec,
             button_choice_spec=button_choice_spec,
-            send_message_format_spec=send_message_format_spec,
         )
 
         return base_prompt
@@ -404,27 +400,6 @@ class PromptManager:
             "content as a text fallback and still completes the reply."
         )
 
-    @staticmethod
-    def _generate_send_message_format_instructions(
-        channel: MessageChannel = None,
-    ) -> str:
-        """
-        根据渠道生成 send_message 工具的格式参数提示。
-        """
-        if channel != MessageChannel.Telegram:
-            return ""
-        return (
-            "- Telegram message formatting: `send_message` supports an optional "
-            "`parse_mode` argument. Leave it empty for default MarkdownV2. When a "
-            "structured Telegram notice would be clearer in HTML, set "
-            "`parse_mode=\"HTML\"` and write the `message` using only Telegram-supported "
-            "HTML tags such as `<b>`, `<i>`, `<u>`, `<s>`, `<code>`, `<pre>`, "
-            "`<blockquote>`, and `<a href=\"...\">`. Keep `title` as plain text; "
-            "the Telegram module renders it as a bold heading automatically. Escape "
-            "user-provided or dynamic values before embedding them in HTML. Do "
-            "not mix Markdown syntax into an HTML-formatted message."
-        )
-
     @staticmethod
     def _generate_button_choice_instructions(
         channel: MessageChannel = None,