added android client

scripts/build-android.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+repo_root="$(cd -- "$script_dir/.." && pwd)"
+android_dir="$repo_root/android"
+
+usage() {
+  echo "usage: $0 {debug|check|release|signed|all}"
+}
+
+case "${1:-}" in
+  debug) tasks=(assembleDebug) ;;
+  check) tasks=(lintDebug testDebugUnitTest) ;;
+  release) tasks=(assembleRelease bundleRelease) ;;
+  signed)
+    required=(
+      ANDROID_RELEASE_STORE_FILE
+      ANDROID_RELEASE_STORE_PASSWORD
+      ANDROID_RELEASE_KEY_ALIAS
+      ANDROID_RELEASE_KEY_PASSWORD
+    )
+    for name in "${required[@]}"; do
+      if [[ -z "${!name:-}" ]]; then
+        echo "error: $name is required for a signed build" >&2
+        exit 2
+      fi
+    done
+    tasks=(assembleRelease bundleRelease)
+    ;;
+  all) tasks=(lintDebug testDebugUnitTest assembleDebug assembleRelease bundleRelease) ;;
+  *) usage >&2; exit 2 ;;
+esac
+
+if [[ -x "$android_dir/gradlew" ]]; then
+  gradle=("$android_dir/gradlew")
+elif command -v gradle >/dev/null 2>&1; then
+  gradle=(gradle)
+else
+  echo "error: Gradle 8.13 is required (no android/gradlew or gradle on PATH)" >&2
+  exit 1
+fi
+
+cd "$android_dir"
+"${gradle[@]}" --no-daemon --stacktrace "${tasks[@]}"