refactor: unify android runtime c++ layout

[DjDeveloperr]

Summary

• move existing Apple FFI sources under NativeScript/ffi/objc and Android JNI Node-API interop under NativeScript/ffi/jni/napi
• move Android runtime C++ into NativeScript/runtime/android and Android engine shims into NativeScript/napi/android
• keep Java sources under platforms/android, restore Android SHERMES-compatible headers, and preserve the shared Hermes runtime surface used by Apple
• update Android CMake/Gradle/test wiring, FFI generated-output paths, and engine-specific Android runtime specs for the unified layout

Validation

• npm run build
• npm run build:macos-cli
• npm run check:ffi-boundaries
• npm run test:macos -> SUCCESS: 713 specs, 0 failures, 10 skipped, 0 disabled
• npm run test:ios -> SUCCESS: 713 specs, 0 failures, 13 skipped, 0 disabled
• Android final matrix: ./gradlew --no-daemon --console=plain -Dandroid.builder.sdkDownload=false -b runtests.gradle runtestsAndVerifyResults -Pengine=<engine> -PndkDirectory=$ANDROID_NDK_ROOT -PndkVersion=27.1.12297006
• Android XML summaries:
  • QUICKJS: 427 tests, 0 failures, 12 skipped
  • QUICKJS_NG: 427 tests, 0 failures, 12 skipped
  • HERMES: 399 tests, 0 failures, 52 skipped
  • SHERMES: 375 tests, 0 failures, 51 skipped
  • JSC: 396 tests, 0 failures, 36 skipped
  • PRIMJS: 427 tests, 0 failures, 12 skipped
  • V8-10: 427 tests, 0 failures, 12 skipped
  • V8-11: 427 tests, 0 failures, 12 skipped
  • V8-13: 427 tests, 0 failures, 12 skipped
• git diff --check

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