android-native: SDL3 APK build for the native client

build-android-native.sh downloads SDL 3.4.16 (sha256-checked), builds
libSDL3.so and libmain.so (native_render + port_platform + embedded
Python) at API 24, and wraps them in the SDLActivity shell under
android-native/ (package org.metin2port.client). push-android-client.sh
copies the 40250 Client directory into the app's files/ with run-as
(--locale XX selects locale_XX.cfg). port_logic links with
--no-dependent-libraries on ELF targets so the verbatim
`#pragma comment(lib, ...)` lines do not break lld.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

android-native/app/build.gradle

@@ -0,0 +1,39 @@
+// SDLActivity shell around native_render (libmain.so). The native libraries, the SDL Java sources
+// and the assets come from ../build-android-native, produced by ../build-android-native.sh.
+plugins {
+    id 'com.android.application'
+}
+
+def nativeBuild = file("${rootDir}/../build-android-native")
+
+android {
+    namespace = 'org.metin2port.client'
+    compileSdk 35
+    defaultConfig {
+        applicationId 'org.metin2port.client'
+        minSdk 24
+        targetSdk 35
+        versionCode 1
+        versionName '0.1'
+        ndk { abiFilters 'arm64-v8a' }
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            signingConfig signingConfigs.debug
+        }
+    }
+    sourceSets.main {
+        java.srcDirs += "${nativeBuild}/_deps/SDL3-3.4.16/android-project/app/src/main/java"
+        jniLibs.srcDirs = ["${nativeBuild}/jniLibs"]
+        assets.srcDirs = ["${nativeBuild}/app-build/native_render/android-assets"]
+    }
+    packagingOptions {
+        jniLibs { useLegacyPackaging = true }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_17
+        targetCompatibility JavaVersion.VERSION_17
+    }
+    lint { abortOnError = false }
+}