feat(gateway): render terminal tool calls as native bash code blocks on markdown platforms (#41215)

Tool-progress now shows a terminal command in a ```bash fenced block —
full command, no surrounding quotes, no label, no 40-char truncation —
instead of the noisy `terminal: "cmd…"` line, on every platform that
renders markdown code blocks (Telegram, Slack, Matrix, WhatsApp, Feishu,
Weixin, Discord). Plain-text platforms keep the compact preview line.

Gated on a new `BasePlatformAdapter.supports_code_blocks` capability
(default False) rather than a hardcoded platform list, so plugin adapters
(Discord lives in plugins/platforms/) opt in by setting the flag. Applies
to both all/new and verbose progress modes, with a safe fallback when the
command arg is missing or blank.

gateway/platforms/feishu.py

@@ -1409,6 +1409,8 @@ def check_feishu_requirements() -> bool:
 class FeishuAdapter(BasePlatformAdapter):
     """Feishu/Lark bot adapter."""
 
+    supports_code_blocks = True  # Feishu renders fenced code blocks
+
     MAX_MESSAGE_LENGTH = 8000
     # Max distinct chat IDs retained in _chat_locks before LRU eviction kicks in.
     CHAT_LOCK_MAX_SIZE: int = 1000