fix(telegram): strip <placeholder> 佔位符防止 HTML parse 錯誤

OpenClaw 生成的 kubectl_command 含 <受影響服務名稱>
在 Telegram HTML parse mode 下造成 'Can't parse entities'
用 regex strip 所有 <...> 佔位符

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

apps/api/src/services/decision_manager.py

@@ -97,11 +97,16 @@ async def _push_decision_to_telegram(
         gateway = get_telegram_gateway()
 
         # 從 proposal_data 提取資料
+        import re as _re
+        def _strip_placeholders(s: str) -> str:
+            """移除 <placeholder> 佔位符，避免 Telegram HTML parse 錯誤"""
+            return _re.sub(r'<[^>]+>', '', s).strip()
+
         target = incident.affected_services[0] if incident.affected_services else "unknown"
         risk_level = proposal_data.get("risk_level", "medium")
-        action = proposal_data.get("action", proposal_data.get("kubectl_command", ""))
+        action = _strip_placeholders(proposal_data.get("action", proposal_data.get("kubectl_command", "")))
         description = proposal_data.get("description", "")
-        reasoning = proposal_data.get("reasoning", "")
+        reasoning = _strip_placeholders(proposal_data.get("reasoning", ""))
         confidence = proposal_data.get("confidence", 0.0)  # 🔴 預設 0.0 表示未經 AI 分析
         source = proposal_data.get("source", "unknown")
         ai_provider = proposal_data.get("provider", "")  # 2026-03-29 ogt: AI 模型來源