fix(build): baseline configuration and proxy setup

- Downgrade AGP 9.0.0 -> 8.9.2, Kotlin 2.2.10 -> 2.1.20, KSP and Compose Multiplatform to compatible versions.
- Switch Gradle wrapper to 8.13 (8.11.1 download unavailable, 9.5.1 incompatible with AGP 8.9).
- Add Gradle proxy settings and disable SDK auto-download to prevent hangs on dl.google.com.
- Remove generated gradle-daemon-jvm.properties causing JetBrains JDK lookup failure.
- Fix JvmVendorSpec.ANY incompatibility on the new toolchain.
- Temporarily disable externalNativeBuild until NDK 27.0.12077973 is installed.
- Baseline ':app:tasks' now passes.

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
-agp = "9.0.0"
-kotlin = "2.2.10"
+agp = "8.9.2"
+kotlin = "2.1.20"
 coreKtx = "1.16.0"
 junit = "4.13.2"
 junitVersion = "1.2.1"
@@ -21,8 +21,8 @@ androidxAnnotationJvm = "1.9.1"
 androidxTestRunner = "1.6.2"
 material3WindowSizeClassAndroid = "1.3.2"
 credentials = "1.5.0"
-composeMultiplatform = "1.8.2"
-ksp = "2.2.10-2.0.2"
+composeMultiplatform = "1.7.3"
+ksp = "2.1.20-1.0.32"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }