fix(bug): remove invalid escape_html import from telegram.helpers

SubMind.py

@@ -20,7 +20,12 @@ from telegram.ext import (
     CallbackContext, CallbackQueryHandler, ConversationHandler
 )
 from telegram.error import TelegramError
-from telegram.helpers import escape_html
+from telegram.helpers import escape_markdown  # Fallback just in case
+import html
+def escape_html(text, version=None):
+    if text is None:
+        return ''
+    return html.escape(str(text))
 
 # --- 加载 .env 和设置 ---
 load_dotenv()