fix(scan): two-phase progress + hosts_processed; clarify status at 99% SNMP tail

Made-with: Cursor

internal/scans/runner_progress_test.go

@@ -0,0 +1,20 @@
+package scans
+
+import "testing"
+
+func TestScanProgressBlend(t *testing.T) {
+	const total = 256
+	if g := scanProgressBlend(0, 0, total); g != 0 {
+		t.Fatalf("0,0 -> 0 got %d", g)
+	}
+	if g := scanProgressBlend(total, total-1, total); g != 99 {
+		t.Fatalf("quick=total full=total-1 -> 99 got %d", g)
+	}
+	if g := scanProgressBlend(total, total, total); g != 100 {
+		t.Fatalf("complete -> 100 got %d", g)
+	}
+	// типичный «застряли на последних SNMP»: ping по всем, SNMP не догнан
+	if g := scanProgressBlend(256, 253, total); g != 99 {
+		t.Fatalf("256,253 -> 99 got %d", g)
+	}
+}