fix(solver): 注入告警 labels 讓 params 模板填充真實值

根因：Solver LLM 不知道 namespace/pod/deployment/instance 真實值，
      recommended_actions.params 模板（{labels.namespace} 等）填不出來
      → Telegram 顯示 kubectl scale deployment  --replicas=（空白）

修復：
- solver.run() 加 incident_labels 參數
- _build_prompt() 把 labels 顯式列出給 LLM 參考
- orchestrator 從 snapshot.alert_info.labels 取出後傳入

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

apps/api/src/services/agent_orchestrator.py

@@ -194,7 +194,9 @@ async def _debate(
 
     # ── Step 2: Solver ─────────────────────────────────────────────────────
     solver = get_solver_agent()
-    plan = await solver.run(diagnosis)
+    # 2026-04-28: 把告警 labels 傳入，讓 Solver params 模板能填真實值
+    _alert_labels = (snapshot.alert_info or {}).get("labels", {}) if snapshot.alert_info else {}
+    plan = await solver.run(diagnosis, incident_labels=_alert_labels)
     await _record_turn(
         session_id=session_id,
         incident_id=incident_id,