fix: strip markdown links, URLs, bold/italic from antaf response

Antaf returns markdown with hyperlinks and formatting that TTS
reads out as raw text. Now cleaned before sending to TTS.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

modules/antaf/antaf_llm.py

@@ -40,13 +40,24 @@ class LLMProvider(LLMProviderBase):
 
     @staticmethod
     def _clean_text(text):
-        """清理阿福返回文本中的脏数据"""
+        """清理阿福返回文本中的脏数据、链接、markdown"""
+        import re
         # 去掉阿福内部状态文本
         junk = [
             "完成资料引用", "内容生成", "正在思考", "正在搜索",
         ]
         for j in junk:
             text = text.replace(j, "")
+        # Markdown链接 [文字](url) → 只保留文字
+        text = re.sub(r'\[([^\]]+)\]\([^)]+\)', r'\1', text)
+        # 裸URL
+        text = re.sub(r'https?://\S+', '', text)
+        # Markdown加粗 **文字** → 文字
+        text = re.sub(r'\*\*([^*]+)\*\*', r'\1', text)
+        # Markdown斜体 *文字* → 文字
+        text = re.sub(r'\*([^*]+)\*', r'\1', text)
+        # 多余空格
+        text = re.sub(r'  +', ' ', text)
         return text.strip()
 
     @staticmethod