fix(telegram): handle parentheses in URLs during MarkdownV2 link conversion

The link regex in format_message used [^)]+ for the URL portion, which
  stopped at the first ) character. URLs with nested parentheses (e.g.
  Wikipedia links like Python_(programming_language)) were improperly parsed.

  Use a better regex, which is the same the Slack adapter uses.

gateway/platforms/telegram.py

@@ -2075,7 +2075,7 @@ class TelegramAdapter(BasePlatformAdapter):
             url = m.group(2).replace('\\', '\\\\').replace(')', '\\)')
             return _ph(f'[{display}]({url})')
 
-        text = re.sub(r'\[([^\]]+)\]\(([^)]+)\)', _convert_link, text)
+        text = re.sub(r'\[([^\]]+)\]\(([^()]*(?:\([^()]*\)[^()]*)*)\)', _convert_link, text)
 
         # 4) Convert markdown headers (## Title) → bold *Title*
         def _convert_header(m):