feat: 新增站内消息系统，支持通知与订单跳转

android/app/build.gradle.kts

@@ -13,6 +13,8 @@ android {
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_17
         targetCompatibility = JavaVersion.VERSION_17
+        // flutter_local_notifications 需要 core library desugaring
+        isCoreLibraryDesugaringEnabled = true
     }
 
     kotlinOptions {
@@ -42,3 +44,7 @@ android {
 flutter {
     source = "../.."
 }
+
+dependencies {
+    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.4")
+}