feat: Introduce Gradle property to control APK splits (#560)

* feat: Introduce Gradle property to control APK splits

This commit introduces a new Gradle project property, `buildSplitApks`, to conditionally enable or disable the generation of ABI-specific (arm64, x86_64) and universal APKs.

Key changes:
- In `app/build.gradle.kts`, the `splits.abi.isEnable` flag is now dynamically set based on the `buildSplitApks` property.
- APK splitting is disabled by default to support standard Android App Bundle (`bundleRelease`) builds.
- The release workflow (`release.yml`) is updated to pass `-PbuildSplitApks=true` when building release APKs for GitHub.
- The general Android build workflow (`android-build.yml`) is also modified to enable splits only for the `Release` variant, ensuring debug builds are not affected.

* chore: Simplify and automate APK split builds

This commit simplifies the build process by automatically enabling ABI splits for APKs (`assemble`) and disabling them for AABs (`bundle`).

This removes the need to manually pass the `-PbuildSplitApks=true` property. The build script now intelligently determines whether to create architecture-specific APKs based on the task being executed (e.g., `assembleRelease` vs. `bundleRelease`).

The GitHub Actions workflows (`release.yml`, `android-build.yml`) have been updated to remove this now-redundant property, streamlining the CI configuration.

app/build.gradle.kts

@@ -48,9 +48,16 @@ android {
 
     // APK splits for GitHub releases - creates arm64, x86_64, and universal APKs
     // AAB for Play Store handles architecture distribution automatically
+    // Auto-detects: splits enabled for assemble tasks, disabled for bundle tasks
+    // Works in Android Studio GUI and CLI without needing extra properties
+    val enableSplits = gradle.startParameter.taskNames.any { taskName ->
+        taskName.contains("assemble", ignoreCase = true) &&
+        !taskName.contains("bundle", ignoreCase = true)
+    }
+
     splits {
         abi {
-            isEnable = true
+            isEnable = enableSplits
             reset()
             include("arm64-v8a", "x86_64", "armeabi-v7a", "x86")
             isUniversalApk = true  // For F-Droid and fallback