Add Garmin server selection and debug logging

Introduces a ComboBox in settings to select between global and China Garmin servers, prompting for app restart when changed. Adds debug logging in garminconnect.cpp to trace domain and API URLs, and logs the loaded domain from settings.

Author: cagnulein

src/garminconnect.cpp

@@ -391,6 +391,9 @@ bool GarminConnect::fetchCsrfToken()
 bool GarminConnect::performLogin(const QString &email, const QString &password, bool suppressMfaSignal)
 {
     qDebug() << "GarminConnect: Performing login...";
+    qDebug() << "GarminConnect: Using domain:" << m_domain;
+    qDebug() << "GarminConnect: SSO URL:" << ssoUrl();
+    qDebug() << "GarminConnect: Connect API URL:" << connectApiUrl();
 
     QString ssoEmbedUrl = ssoUrl() + SSO_EMBED_PATH;
 
@@ -1401,6 +1404,7 @@ void GarminConnect::loadTokensFromSettings()
     m_oauth1Token.oauth_token = settings.value(QZSettings::garmin_oauth1_token, QZSettings::default_garmin_oauth1_token).toString();
     m_oauth1Token.oauth_token_secret = settings.value(QZSettings::garmin_oauth1_token_secret, QZSettings::default_garmin_oauth1_token_secret).toString();
     m_domain = settings.value(QZSettings::garmin_domain, QZSettings::default_garmin_domain).toString();
+    qDebug() << "GarminConnect: Loaded Garmin domain from settings:" << m_domain;
 
     if (!m_oauth2Token.access_token.isEmpty()) {
         qDebug() << "GarminConnect: Loaded tokens from settings (OAuth1 + OAuth2)";

src/settings.qml

@@ -6725,6 +6725,87 @@ import Qt.labs.platform 1.1
                         }
                     }
 
+                    RowLayout {
+                        spacing: 10
+                        Label {
+                            text: qsTr("Garmin Server:")
+                            Layout.fillWidth: true
+                        }
+                        ComboBox {
+                            id: garminServerComboBox
+                            Layout.fillHeight: false
+                            Layout.alignment: Qt.AlignRight | Qt.AlignVCenter
+                            model: ["Global (garmin.com)", "China (garmin.cn)"]
+                            currentIndex: settings.garmin_domain === "garmin.cn" ? 1 : 0
+                            onCurrentIndexChanged: {
+                                var newDomain = currentIndex === 1 ? "garmin.cn" : "garmin.com";
+                                if (newDomain !== settings.garmin_domain) {
+                                    rootItem.garmin_connect_logout();
+                                    settings.garmin_domain = newDomain;
+                                    garminServerRestartDialog.open();
+                                }
+                            }
+                        }
+                    }
+
+                    // Garmin Server Change Restart Dialog
+                    Popup {
+                        id: garminServerRestartDialog
+                        modal: true
+                        focus: true
+                        closePolicy: Popup.CloseOnEscape
+                        anchors.centerIn: Overlay.overlay
+                        width: Math.min(parent.width * 0.9, 400)
+
+                        ColumnLayout {
+                            anchors.fill: parent
+                            spacing: 20
+
+                            Label {
+                                text: "Restart Required"
+                                font.pixelSize: 18
+                                font.bold: true
+                                Layout.fillWidth: true
+                                horizontalAlignment: Text.AlignHCenter
+                            }
+
+                            Label {
+                                text: "The application needs to be restarted to apply the Garmin server change."
+                                wrapMode: Text.WordWrap
+                                Layout.fillWidth: true
+                                horizontalAlignment: Text.AlignHCenter
+                            }
+
+                            RowLayout {
+                                spacing: 10
+                                Layout.fillWidth: true
+                                Layout.alignment: Qt.AlignHCenter
+
+                                Button {
+                                    text: "Cancel"
+                                    Layout.preferredWidth: 120
+                                    onClicked: {
+                                        garminServerRestartDialog.close();
+                                        // Revert the change
+                                        var currentDomain = settings.garmin_domain;
+                                        garminServerComboBox.currentIndex = currentDomain === "garmin.cn" ? 1 : 0;
+                                    }
+                                }
+
+                                Button {
+                                    text: "Restart App"
+                                    Layout.preferredWidth: 120
+                                    highlighted: true
+                                    onClicked: {
+                                        garminServerRestartDialog.close();
+                                        toast.show("Restarting application...");
+                                        Qt.quit();
+                                    }
+                                }
+                            }
+                        }
+                    }
+
                     Button {
                         text: "Test Garmin Login"
                         Layout.alignment: Qt.AlignHCenter