fix: policy replaces floors (not intersection)

When tenant policy exists and enabled, allow_zone_ids REPLACES
the candidate floor list entirely. Phase 3 simplified.
Bump v2.0.20

maven-cw-elevator-application/releases/cw-elevator-application-V2.0.20.20260505/common-java.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+# shellcheck shell=bash
+# 由 v1-legacy/run.sh、v2-maven/run.sh source：JAVA_HOME；非 JDK8 时追加 --add-opens。
+#
+# === 本机 JDK 8 安装根目录（含 bin/java）；换机器只需改下行默认路径或通过环境变量覆盖 ===
+: "${DEPLOY_JDK8:=/usr/lib/jvm/java-8-openjdk-amd64}"
+
+_pick_java_home() {
+  if [[ "${ELEVATOR_USE_ENV_JAVA:-0}" == "1" ]] && [[ -n "${JAVA_HOME:-}" && -x "${JAVA_HOME}/bin/java" ]]; then
+    return 0
+  fi
+  if [[ -x "${DEPLOY_JDK8}/bin/java" ]]; then
+    export JAVA_HOME="${DEPLOY_JDK8}"
+    return 0
+  fi
+  for d in /usr/lib/jvm/java-8-openjdk-amd64 /usr/lib/jvm/java-1.8.0-openjdk; do
+    if [[ -x "$d/bin/java" ]]; then
+      export JAVA_HOME="$d"
+      return 0
+    fi
+  done
+  if [[ -n "${JAVA_HOME:-}" && -x "${JAVA_HOME}/bin/java" ]]; then
+    return 0
+  fi
+  export JAVA_HOME="${JAVA_HOME:-${DEPLOY_JDK8}}"
+}
+
+_jdk8_open_flags() {
+  local java="$1"
+  if "$java" -version 2>&1 | grep -qE 'version "1\.8\.'; then
+    echo ""
+    return
+  fi
+  echo "--add-opens=java.base/java.lang=ALL-UNNAMED"
+  echo "--add-opens=java.base/java.lang.reflect=ALL-UNNAMED"
+  echo "--add-opens=java.base/java.util=ALL-UNNAMED"
+  echo "--add-opens=java.base/java.io=ALL-UNNAMED"
+}