feat(deploy): add rebuild command with --no-cache support

Add do_rebuild function to rebuild Docker images without cache.
Supports rebuilding individual services or all services at once.

Usage:
  ./deploy.sh rebuild conversation  # rebuild single service
  ./deploy.sh rebuild all           # rebuild all services

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

deploy.sh

@@ -597,6 +597,34 @@ start_all() {
     do_status
 }
 
+# 重新构建 Docker 镜像 (--no-cache)
+do_rebuild() {
+    local target=${1:-all}
+
+    if [ "$target" = "all" ]; then
+        log_step "重新构建所有服务镜像 (--no-cache)..."
+        $DOCKER_COMPOSE build --no-cache
+    else
+        # 获取服务名
+        local service_name=""
+        case $target in
+            user) service_name="user-service" ;;
+            payment) service_name="payment-service" ;;
+            knowledge) service_name="knowledge-service" ;;
+            conversation) service_name="conversation-service" ;;
+            evolution) service_name="evolution-service" ;;
+            nginx) service_name="nginx" ;;
+            kong) service_name="kong" ;;
+            *) service_name="$target-service" ;;
+        esac
+
+        log_step "重新构建 $target 镜像 (--no-cache)..."
+        $DOCKER_COMPOSE build --no-cache "$service_name"
+    fi
+
+    log_success "镜像重新构建完成"
+}
+
 # 启动入口
 do_start() {
     local target=${1:-all}
@@ -1368,6 +1396,11 @@ show_help() {
                                   conversation, user, payment, knowledge, evolution,
                                   web-client, admin-client
 
+  rebuild [target]        重新构建 Docker 镜像 (--no-cache)
+                          target: all, conversation, user, payment, knowledge, evolution,
+                                  nginx, kong
+                          ⚠️ 完全重新构建，忽略缓存
+
   start [target] [mode]   启动服务
                           target: all, infra, kong, nginx, backend,
                                   conversation, user, payment, knowledge, evolution,
@@ -1426,6 +1459,8 @@ show_help() {
   ./deploy.sh logs conversation 200     # 查看对话服务最近200行日志
   ./deploy.sh clean all                 # 清理所有构建产物和依赖
   ./deploy.sh full-reset                # ⚠️ 重置所有数据库数据
+  ./deploy.sh rebuild conversation      # 重新构建对话服务镜像 (--no-cache)
+  ./deploy.sh rebuild all               # 重新构建所有服务镜像 (--no-cache)
   ./deploy.sh db init                   # 初始化数据库 (首次部署)
   ./deploy.sh db backup                 # 备份数据库
   ./deploy.sh db migrate                # 执行数据库迁移
@@ -1459,6 +1494,9 @@ main() {
         build)
             do_build "$@"
             ;;
+        rebuild)
+            do_rebuild "$@"
+            ;;
         start)
             do_start "$@"
             ;;