Update AGP version and add Gradle build properties

Upgraded Android Gradle Plugin version from 8.13.2 to 9.0.0 in libs.versions.toml. Added and updated several Android and Kotlin build properties in gradle.properties to refine build behavior and feature flags.

V2rayNG/gradle.properties

@@ -21,4 +21,14 @@ kotlin.code.style=official
 # resources declared in the library itself and none from the library's dependencies,
 # thereby reducing the size of the R class for that library
 android.nonTransitiveRClass=true
-kotlin.incremental=true
+kotlin.incremental=true
+android.defaults.buildfeatures.resvalues=true
+android.sdk.defaultTargetSdkToCompileSdkIfUnset=false
+android.enableAppCompileTimeRClass=false
+android.usesSdkInManifest.disallowed=false
+android.uniquePackageNames=false
+android.dependency.useConstraints=true
+android.r8.strictFullModeForKeepRules=false
+android.r8.optimizedResourceShrinking=false
+android.builtInKotlin=false
+android.newDsl=false

V2rayNG/gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-agp = "8.13.2"
+agp = "9.0.0"
 desugarJdkLibs = "2.1.5"
 gradleLicensePlugin = "0.9.8"
 kotlin = "2.3.0"