Initial commit: ContactSync Android app

- SyncAdapter with account type com.bitrix24.contacts.sync
- Two-phase sync: download to Room DB, then import to phone contacts
- FCM push for instant contact addition
- WorkManager: periodic sync (30min) + heartbeat (1h)
- QR code activation (JSON format)
- Event log UI with LiveData
- Auto-update mechanism via version.php
- Duplicate contacts cleanup
- CALLER_IS_SYNCADAPTER optimization for bulk inserts

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

gradlew

@@ -0,0 +1,73 @@
+#!/bin/sh
+
+##############################################################################
+#  Gradle start up script for POSIX generated by Gradle.
+##############################################################################
+
+# Add default JVM options here.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+APP_NAME="Gradle"
+APP_BASE_NAME=$(basename "$0")
+MAX_FD="maximum"
+warn () { echo "$*"; }
+die () { echo "$*"; exit 1; }
+
+# OS specific support
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$(uname)" in
+  CYGWIN* ) cygwin=true ;;
+  Darwin* ) darwin=true ;;
+  MSYS* | MINGW* ) msys=true ;;
+  NonStop* ) nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use
+if [ -n "$JAVA_HOME" ] ; then
+    JAVACMD="$JAVA_HOME/bin/java"
+else
+    JAVACMD="java"
+fi
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+      ;;
+    esac
+    case $MAX_FD in
+      '' | soft) :;;
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+      ;;
+    esac
+fi
+
+# Resolve links: $0 may be a link
+app_path=$0
+while
+    APP_HOME=${app_path%"${app_path##*/}"}
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld -- "$app_path" )
+    link=${ls#*' -> '}
+    case $link in
+      /*)   app_path=$link ;;
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Collect all arguments for the java command
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$@"
+
+exec "$JAVACMD" "$@"