Build lightweight AI agent admin

docker/backend/wait-for-it.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -e
+
+host="$1"
+port="$2"
+timeout="${3:-60}"
+
+if [ -z "$host" ] || [ -z "$port" ]; then
+    echo "用法: $0 <host> <port> [timeout]"
+    exit 1
+fi
+
+echo "等待 $host:$port (超时: ${timeout}s)..."
+
+end_time=$(($(date +%s) + timeout))
+while [ $(date +%s) -lt $end_time ]; do
+    if timeout 1 bash -c "echo > /dev/tcp/${host}/${port}" 2>/dev/null; then
+        echo "$host:$port 已可用"
+        exit 0
+    fi
+    sleep 2
+done
+
+echo "错误: $host:$port 在 ${timeout} 秒内未能连接"
+exit 1