[client] update tests and comment

Author: capcom6

smsgateway/client.go

@@ -14,7 +14,7 @@ import (
 const BaseURL = "https://api.sms-gate.app/3rdparty/v1"
 const settingsPath = "/settings"
 
-// BASE_URL is deprecated, use BaseURL instead
+// Deprecated: BASE_URL is kept for backward compatibility. Use BaseURL instead.
 //
 //nolint:revive,staticcheck // backward compatibility
 const BASE_URL = BaseURL

smsgateway/config_test.go

@@ -52,7 +52,7 @@ func TestConfig_WithBaseURL(t *testing.T) {
 		{
 			name:     "with empty base URL should use default",
 			baseURL:  "",
-			expected: "https://api.sms-gate.app/3rdparty/v1",
+			expected: smsgateway.BaseURL,
 		},
 	}