feat(notifications): tag autonomous repair actions with [AUTO] prefix

Per user request: every AI-driven repair must surface a Telegram trace
even when it succeeds, so nobody can later deny what the autonomy did.
Adds 🤖 [AUTO] markers and an explicit `Actor: leWOOOgo (autonomous)`
line to both success and failure status messages emitted by
_push_auto_repair_result, making them clearly distinguishable from
human-clicked approval cards.

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

apps/api/src/services/decision_manager.py

@@ -1038,17 +1038,22 @@ async def _push_auto_repair_result(
             except Exception as _k8s_err:
                 logger.debug("k8s_state_after_failed", incident_id=inc_id, error=str(_k8s_err))
 
+        # 2026-05-02 ogt + Claude Sonnet 4.6: 強制標記 [AUTO]，避免事後抵賴
+        # 統帥要求「就算是自動化處理，也要發告警訊息出來」—— 所有自治動作必須留痕，
+        # 且 Telegram 上能明顯與人工點擊區隔。
         if success:
             delta_line = f"\n├ 指標: <code>{metrics_delta_text}</code>" if metrics_delta_text else ""
             status_line = (
-                f"✅ <b>自動修復完成</b>\n"
-                f"├ <code>{action[:100] if action else '已執行'}</code>"
+                f"🤖 <b>[AUTO] AI 自動修復完成</b>\n"
+                f"├ 動作: <code>{action[:100] if action else '已執行'}</code>\n"
+                f"├ Actor: leWOOOgo (autonomous)"
                 f"{delta_line}"
             )
         else:
             status_line = (
-                f"❌ <b>自動修復失敗，請人工介入</b>\n"
+                f"🤖❌ <b>[AUTO] AI 自動修復失敗，已升級人工介入</b>\n"
                 f"├ 動作: <code>{action[:80] if action else '未知'}</code>\n"
+                f"├ Actor: leWOOOgo (autonomous)\n"
                 f"└ 錯誤: {error[:100] if error else '未知錯誤'}"
             )