ai: avoid fallback for atlasbot queries

backend/atlas_portal/routes/ai.py

@@ -28,6 +28,15 @@ def register(app) -> None:
         if atlasbot_reply:
             elapsed_ms = int((time.time() - started) * 1000)
             return jsonify({"reply": atlasbot_reply, "latency_ms": elapsed_ms, "source": "atlasbot"})
+        if _requires_atlasbot(user_message):
+            elapsed_ms = int((time.time() - started) * 1000)
+            return jsonify(
+                {
+                    "reply": "Atlasbot is busy. Please try again in a moment.",
+                    "latency_ms": elapsed_ms,
+                    "source": "atlasbot",
+                }
+            )
 
         messages: list[dict[str, str]] = []
         if settings.AI_CHAT_SYSTEM_PROMPT:
@@ -81,6 +90,24 @@ def _atlasbot_answer(message: str) -> str:
     except (httpx.RequestError, ValueError):
         return ""
 
+def _requires_atlasbot(message: str) -> bool:
+    text = (message or "").lower()
+    hints = (
+        "atlas",
+        "titan",
+        "cluster",
+        "node",
+        "nodes",
+        "pod",
+        "pods",
+        "postgres",
+        "database",
+        "grafana",
+        "victoria",
+        "metrics",
+    )
+    return any(hint in text for hint in hints)
+
 
 def _discover_ai_meta() -> dict[str, str]:
     meta = {