Add app settings with update track and auto-check options

- Add AppSettingsScreen with update track selection and auto-check toggle
- Remove checkUpdateAvailable() as all vendors now support update checking
- Add missing Chinese translations for update-related strings

app/build.gradle

@@ -6,6 +6,7 @@ plugins {
     id "kotlin-parcelize"
     id "com.google.devtools.ksp"
     id "org.jetbrains.kotlin.plugin.compose"
+    id "org.jetbrains.kotlin.plugin.serialization"
     id "com.github.triplet.play"
     id "org.jlleitschuh.gradle.ktlint"
 }
@@ -121,6 +122,7 @@ dependencies {
     implementation "androidx.work:work-runtime-ktx:2.10.3"
     implementation "androidx.browser:browser:1.9.0"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.10.2"
+    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.3"
 
     // DO NOT UPDATE (minSdkVersion updated)
     implementation "com.blacksquircle.ui:editorkit:2.2.0"