refactor(pkg): merge pkg/utils into pkg/util

Consolidate pure helper packages under pkg/util and update imports.

pkg/util/network_test.go

@@ -0,0 +1,33 @@
+package util
+
+import (
+	"testing"
+)
+
+func TestIsPrivateIPv4(t *testing.T) {
+	tests := []struct {
+		ip       string
+		expected bool
+	}{
+		{"127.0.0.1", false}, // Loopback is not in RFC 1918 private range
+		{"10.0.0.1", true},
+		{"172.16.0.1", true},
+		{"192.168.1.1", true},
+		{"8.8.8.8", false},
+		{"invalid-ip", false},
+	}
+
+	for _, tt := range tests {
+		result := isPrivateIPv4(tt.ip)
+		if result != tt.expected {
+			t.Errorf("isPrivateIPv4(%q) = %v, expected %v", tt.ip, result, tt.expected)
+		}
+	}
+}
+
+func TestGetIP(t *testing.T) {
+	ip := GetIP()
+	// GetIP should return empty if no private IPv4 address is configured, or a valid IP.
+	// We just ensure it doesn't panic.
+	t.Logf("GetIP returned: %q", ip)
+}