fix(escalation): dedup escalation card by fingerprint + 24h TTL

接續 b3a0f0d7（decision card dedup）—— 統帥 17:35 鐵證：4 條 ESCALATION P0
連發（HostOutOfDiskSpace + 3×HostDiskUsageHigh，全 target=node-exporter-110，
全不同 INC ID C9CD6E/FB7944/559B54/C1BBF3）。

decision card 修了但 escalation card 走另一條路徑，根因相同：
- emergency_escalation_service.py:31 dedup key 綁 incident_id (uuid4 隨機)
- TTL 900s 比 sweeper 重觸週期 1h 短

修法：
- escalate_auto_repair_unavailable() 改用 alertname+target fingerprint dedup
- TTL 900s → 86400s，與 decision_manager.py:574 對齊

drift_auto_adopt 路徑暫不動（TTL 已 3600s + report_id 非隨機，非當前問題）。

Tests: 7 passed (escalation/emergency 相關用例)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/api/src/services/emergency_escalation_service.py

@@ -28,12 +28,19 @@ async def escalate_auto_repair_unavailable(
 ) -> None:
     """Open an emergency channel when auto repair cannot safely continue."""
 
-    dedup_key = f"auto_repair:emergency_escalated:{incident_id}"
-    if not await _dedup_first_send(dedup_key, ttl=900, event="auto_repair"):
+    # 2026-05-02 Claude Opus 4.7 + 統帥 ogt：dedup key 從 incident_id → fingerprint(alertname+target)
+    # 鐵證：4 條 ESCALATION 卡 17:35-17:36 連發（HostOutOfDiskSpace + 3×HostDiskUsageHigh，全 target=node-exporter-110）
+    # 原本 incident_id 是 uuid4 隨機，TTL 900s 太短 → 同症狀換 INC ID 完全不去重
+    # 改成 alertname+target fingerprint + TTL 86400s，與 decision_manager.py:218 對齊。
+    _alertname_fp = (alert_type or "AutoRepairBlocked").strip().lower().replace(" ", "_")[:60]
+    _target_fp = (target_resource or "unknown").lower()[:40]
+    dedup_key = f"auto_repair:emergency_escalated:fp:{_alertname_fp}:{_target_fp}"
+    if not await _dedup_first_send(dedup_key, ttl=86400, event="auto_repair"):
         logger.info(
             "auto_repair_escalation_dedup_skipped",
             incident_id=incident_id,
             approval_id=approval_id,
+            fingerprint=f"{_alertname_fp}:{_target_fp}",
         )
         return