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/src/main/AndroidManifest.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <uses-feature android:name="android.hardware.vulkan.version" android:version="0x400003" android:required="true" />
+    <uses-feature android:name="android.hardware.touchscreen" android:required="false" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.VIBRATE" />
+
+    <application android:label="@string/app_name"
+        android:allowBackup="false"
+        android:extractNativeLibs="true"
+        android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
+        android:hardwareAccelerated="true"
+        android:usesCleartextTraffic="true">
+        <activity android:name=".MainActivity"
+            android:label="@string/app_name"
+            android:alwaysRetainTaskState="true"
+            android:launchMode="singleInstance"
+            android:screenOrientation="sensorLandscape"
+            android:configChanges="layoutDirection|locale|orientation|uiMode|screenLayout|screenSize|smallestScreenSize|keyboard|keyboardHidden|navigation"
+            android:preferMinimalPostProcessing="true"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

android-native/app/src/main/java/org/metin2port/client/MainActivity.java

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+package org.metin2port.client;
+
+import android.content.Intent;
+
+import org.libsdl.app.SDLActivity;
+
+/**
+ * Runs native_render's main() (libmain.so). Command-line arguments come from the launch intent,
+ * e.g. adb shell am start -n org.metin2port.client/.MainActivity \
+ *          --es args "--live-server 192.168.21.203:11000:13000 --login-screen"
+ * Without arguments the client runs against the in-process fake server once Client/ is in files/.
+ */
+public class MainActivity extends SDLActivity {
+    @Override
+    protected String[] getLibraries() {
+        return new String[] { "SDL3", "main" };
+    }
+
+    @Override
+    protected String[] getArguments() {
+        Intent intent = getIntent();
+        String args = intent != null ? intent.getStringExtra("args") : null;
+        if (args == null || args.trim().isEmpty())
+            return new String[0];
+        return args.trim().split("\\s+");
+    }
+}

android-native/app/src/main/res/values/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Metin2</string>
+</resources>