fix(chat): AI 回覆截斷問題 — 強制 persona + Markdown 清理 + 600字上限

問題: OpenClaw/NemoClaw 回覆 Markdown 語法 + 超長，Telegram 顯示截斷
修正:
1. chat_manager: _call_openclaw/_call_nemotron 強制前置 persona (含不超過300字規範)
2. telegram_gateway: _clean_ai_reply() 移除 **bold** *italic* # header 語法
   移除 deepseek-r1 <think> 標籤，截斷 > 600 字並在段落邊界截

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/services/chat_manager.py

@@ -85,7 +85,11 @@ class ChatManager:
 
         2026-04-03 ogt: 老闆指示改用 Gemini，費用控管月上限 $10 USD
         每次回覆附帶 token 用量與費用統計
+
+        2026-04-10 Claude Code: 強制合併 OPENCLAW_PERSONA，確保字數限制與格式規範
         """
+        # 強制在 system_prompt 前置 persona，確保 LLM 遵守字數與格式
+        system_prompt = f"{OPENCLAW_PERSONA}\n{system_prompt}"
         import httpx
         from src.core.config import get_settings
         settings = get_settings()
@@ -153,7 +157,12 @@ class ChatManager:
 
         2026-04-09 ogt: 改接 192.168.0.111 Ollama deepseek-r1:14b，SRE 推理能力最強
         deepseek-r1 含 <think> 標籤，需過濾後才回傳
+
+        2026-04-10 Claude Code: 強制合併 NEMOCLAW_PERSONA，確保字數限制與格式規範
         """
+        # 強制在 system_prompt 前置 persona
+        system_prompt = f"{NEMOCLAW_PERSONA}\n{system_prompt}"
+
         import httpx
         import re
 

apps/api/src/services/telegram_gateway.py

@@ -3683,14 +3683,32 @@ class TelegramGateway:
 
         context = await chat_mgr.get_system_context()
 
+        def _clean_ai_reply(text: str, max_chars: int = 600) -> str:
+            """清理 AI 回覆：移除 Markdown 語法，截斷超長內容"""
+            import re
+            # 移除 Markdown bold/italic (**text**, *text*, __text__, _text_)
+            text = re.sub(r'\*\*(.+?)\*\*', r'\1', text)
+            text = re.sub(r'\*(.+?)\*', r'\1', text)
+            text = re.sub(r'__(.+?)__', r'\1', text)
+            text = re.sub(r'_(.+?)_', r'\1', text)
+            # 移除 Markdown header (#, ##, ###)
+            text = re.sub(r'^#{1,3}\s+', '', text, flags=re.MULTILINE)
+            # 移除 <think> 標籤（deepseek-r1）
+            text = re.sub(r'<think>.*?</think>', '', text, flags=re.DOTALL).strip()
+            # 截斷
+            if len(text) > max_chars:
+                text = text[:max_chars].rsplit('\n', 1)[0] + '…'
+            return text.strip()
+
         if mention_openclaw and not mention_nemo:
             # 只 OpenClaw 回應
             result = await chat_mgr._call_openclaw(
                 f"{context}\n用戶 {username} 在 SRE 戰情室問你：",
                 clean_text,
             )
+            body = _clean_ai_reply(result) if result else '🔴 無響應'
             await self.send_as_openclaw(
-                text=f"🦞 <b>OpenClaw</b>\n\n{result or '🔴 無響應'}",
+                text=f"🦞 <b>OpenClaw</b>\n\n{body}",
                 reply_to_message_id=message_id,
             )
 
@@ -3700,8 +3718,9 @@ class TelegramGateway:
                 f"{context}\n用戶 {username} 在 SRE 戰情室問你：",
                 clean_text,
             )
+            body = _clean_ai_reply(result) if result else '🔴 無響應 (NIM 超時)'
             await self.send_as_nemotron(
-                text=f"🤖 <b>NemoClaw</b>\n\n{result or '🔴 無響應 (NIM 超時)'}",
+                text=f"🤖 <b>NemoClaw</b>\n\n{body}",
                 reply_to_message_id=message_id,
             )
 
@@ -3717,13 +3736,13 @@ class TelegramGateway:
 
             if oc_result and not isinstance(oc_result, Exception):
                 await self.send_as_openclaw(
-                    text=f"🦞 <b>OpenClaw</b>\n\n{oc_result}",
+                    text=f"🦞 <b>OpenClaw</b>\n\n{_clean_ai_reply(oc_result)}",
                     reply_to_message_id=message_id,
                 )
 
             if nemo_result and not isinstance(nemo_result, Exception):
                 await self.send_as_nemotron(
-                    text=f"🤖 <b>NemoClaw</b>\n\n{nemo_result}",
+                    text=f"🤖 <b>NemoClaw</b>\n\n{_clean_ai_reply(nemo_result)}",
                     reply_to_message_id=message_id,
                 )