feat: support custom tracker url (#59)

ui/flutter/pubspec.lock

@@ -376,7 +376,7 @@ packages:
     source: hosted
     version: "3.2.2"
   intl:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: intl
       url: "https://pub.flutter-io.cn"
@@ -494,6 +494,20 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "2.1.0"
+  package_info_plus:
+    dependency: "direct main"
+    description:
+      name: package_info_plus
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "3.0.2"
+  package_info_plus_platform_interface:
+    dependency: transitive
+    description:
+      name: package_info_plus_platform_interface
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.1"
   path:
     dependency: transitive
     description: