feat: add tracking for auth request success and failure counts

- Introduced `Success` and `Failed` fields in auth records to track request outcomes.
- Updated `/v0/management/auth-files` and `/v0/management/api-key-usage` responses to include success and failure counts.
- Enhanced tests to validate tracking logic and API responses.

sdk/cliproxy/auth/conductor_recent_requests_test.go

@@ -31,6 +31,10 @@ func TestManagerMarkResultRecordsRecentRequests(t *testing.T) {
 		t.Fatalf("GetByID returned ok=%v auth=%v", ok, gotAuth)
 	}
 
+	if gotAuth.Success != 1 || gotAuth.Failed != 1 {
+		t.Fatalf("auth totals = success=%d failed=%d, want 1/1", gotAuth.Success, gotAuth.Failed)
+	}
+
 	snapshot := gotAuth.RecentRequestsSnapshot(time.Now())
 	var successTotal int64
 	var failedTotal int64
@@ -42,3 +46,50 @@ func TestManagerMarkResultRecordsRecentRequests(t *testing.T) {
 		t.Fatalf("totals = success=%d failed=%d, want 1/1", successTotal, failedTotal)
 	}
 }
+
+func TestManagerUpdatePreservesRecentRequestsAndTotals(t *testing.T) {
+	mgr := NewManager(nil, nil, nil)
+	auth := &Auth{
+		ID:       "auth-1",
+		Provider: "antigravity",
+		Metadata: map[string]any{
+			"type": "antigravity",
+		},
+	}
+	if _, err := mgr.Register(WithSkipPersist(context.Background()), auth); err != nil {
+		t.Fatalf("Register returned error: %v", err)
+	}
+
+	mgr.MarkResult(context.Background(), Result{AuthID: "auth-1", Provider: "antigravity", Model: "gpt-5", Success: true})
+
+	updated := &Auth{
+		ID:       "auth-1",
+		Provider: "antigravity",
+		Metadata: map[string]any{
+			"type": "antigravity",
+			"note": "updated",
+		},
+	}
+	if _, err := mgr.Update(WithSkipPersist(context.Background()), updated); err != nil {
+		t.Fatalf("Update returned error: %v", err)
+	}
+
+	gotAuth, ok := mgr.GetByID("auth-1")
+	if !ok || gotAuth == nil {
+		t.Fatalf("GetByID returned ok=%v auth=%v", ok, gotAuth)
+	}
+	if gotAuth.Success != 1 || gotAuth.Failed != 0 {
+		t.Fatalf("auth totals = success=%d failed=%d, want 1/0", gotAuth.Success, gotAuth.Failed)
+	}
+
+	snapshot := gotAuth.RecentRequestsSnapshot(time.Now())
+	var successTotal int64
+	var failedTotal int64
+	for _, bucket := range snapshot {
+		successTotal += bucket.Success
+		failedTotal += bucket.Failed
+	}
+	if successTotal != 1 || failedTotal != 0 {
+		t.Fatalf("bucket totals = success=%d failed=%d, want 1/0", successTotal, failedTotal)
+	}
+}