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>

push-android-client.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+# Copy the 40250 Client/ directory into the Android app's private files/ (SDL_GetPrefPath), where
+# native_render looks for files/Client/pack/Index. Needs the debug APK installed (run-as).
+#   ./push-android-client.sh [--locale XX] [CLIENT_DIR]
+# --locale XX writes the pushed locale.cfg from CLIENT_DIR/locale_XX.cfg. --locale zh defaults
+# CLIENT_DIR to build/zh-locale/Client (script/build_zh_locale.py), whose pack/ registers locale_zh.
+# Symbolic links in CLIENT_DIR (the zh client links the original packs) are copied as their targets.
+set -euo pipefail
+cd "$(dirname "$0")"
+PKG=org.metin2port.client
+LOCALE=""
+if [ "${1:-}" = "--locale" ]; then
+	LOCALE="${2:?--locale needs a locale code}"
+	shift 2
+fi
+if [ "$LOCALE" = zh ]; then
+	CLIENT="${1:-build/zh-locale/Client}"
+else
+	CLIENT="${1:-Client}"
+fi
+[ -f "$CLIENT/pack/Index" ] || { echo "$CLIENT/pack/Index not found" >&2; exit 1; }
+# The archive's top directory is basename(CLIENT DIR); the app reads files/Client.
+[ "$(basename "$CLIENT")" = Client ] || { echo "CLIENT_DIR must be named Client" >&2; exit 1; }
+if [ -n "$LOCALE" ]; then
+	[ -f "$CLIENT/locale_$LOCALE.cfg" ] || { echo "$CLIENT/locale_$LOCALE.cfg not found" >&2; exit 1; }
+	pack="$(cut -d' ' -f3 < "$CLIENT/locale_$LOCALE.cfg" | tr -d '\r\n')"
+	tr -d '\r' < "$CLIENT/pack/Index" | grep -qxF "locale_$pack" ||
+		{ echo "locale_$pack is not registered in $CLIENT/pack/Index" >&2; exit 1; }
+fi
+TMP=/data/local/tmp/mt-client.tar
+echo "packing $CLIENT ..."
+tar -h -C "$(dirname "$CLIENT")" -cf - "$(basename "$CLIENT")" | adb shell "cat > $TMP"
+echo "unpacking into $PKG files/ ..."
+adb shell "run-as $PKG sh -c 'mkdir -p files && rm -rf files/Client && cd files && tar -xf $TMP' && rm -f $TMP"
+if [ -n "$LOCALE" ]; then
+	adb shell "run-as $PKG sh -c 'cp files/Client/locale_$LOCALE.cfg files/Client/locale.cfg'"
+	echo "locale.cfg: $(adb shell "run-as $PKG cat files/Client/locale.cfg")"
+fi
+adb shell "run-as $PKG ls files/Client/pack/Index" >/dev/null && echo "done: files/Client"