优化: 多模块功能修复与体验改进 (#34)

1. 保留策略清理后自动删除空文件夹（新增 StorageDirCleaner 接口）
2. 备份任务删除时清理远端文件但保留备份记录
3. 节点管理修复：本机 IP/版本检测、Heartbeat OS/Arch 修正、新增编辑功能
4. 审计日志规范化：统一格式、丰富详情、节点操作增加审计记录
5. 系统设置移除一键更新操作，仅保留版本检查
6. Rclone 配置项分层展示（必填 + 高级可选折叠）
7. DirectoryPicker 目录选择器样式优化

server/internal/http/node_handler.go

@@ -1,6 +1,7 @@
 package http
 
 import (
+	"fmt"
 	stdhttp "net/http"
 	"strconv"
 
@@ -10,11 +11,12 @@ import (
 )
 
 type NodeHandler struct {
-	service *service.NodeService
+	service      *service.NodeService
+	auditService *service.AuditService
 }
 
-func NewNodeHandler(service *service.NodeService) *NodeHandler {
-	return &NodeHandler{service: service}
+func NewNodeHandler(service *service.NodeService, auditService *service.AuditService) *NodeHandler {
+	return &NodeHandler{service: service, auditService: auditService}
 }
 
 func (h *NodeHandler) List(c *gin.Context) {
@@ -51,6 +53,8 @@ func (h *NodeHandler) Create(c *gin.Context) {
 		response.Error(c, err)
 		return
 	}
+	recordAudit(c, h.auditService, "node", "create", "node", "", input.Name,
+		fmt.Sprintf("创建远程节点「%s」", input.Name))
 	response.Success(c, gin.H{"token": token})
 }
 
@@ -64,6 +68,8 @@ func (h *NodeHandler) Delete(c *gin.Context) {
 		response.Error(c, err)
 		return
 	}
+	recordAudit(c, h.auditService, "node", "delete", "node", fmt.Sprintf("%d", id), "",
+		fmt.Sprintf("删除节点 (ID: %d)", id))
 	response.Success(c, nil)
 }
 
@@ -82,18 +88,41 @@ func (h *NodeHandler) ListDirectory(c *gin.Context) {
 	response.Success(c, entries)
 }
 
+func (h *NodeHandler) Update(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 32)
+	if err != nil {
+		response.Error(c, err)
+		return
+	}
+	var input service.NodeUpdateInput
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(stdhttp.StatusBadRequest, gin.H{"code": "INVALID_INPUT", "message": err.Error()})
+		return
+	}
+	item, err := h.service.Update(c.Request.Context(), uint(id), input)
+	if err != nil {
+		response.Error(c, err)
+		return
+	}
+	recordAudit(c, h.auditService, "node", "update", "node", fmt.Sprintf("%d", id), item.Name,
+		fmt.Sprintf("更新节点「%s」(ID: %d)", item.Name, id))
+	response.Success(c, item)
+}
+
 func (h *NodeHandler) Heartbeat(c *gin.Context) {
 	var input struct {
 		Token        string `json:"token" binding:"required"`
 		Hostname     string `json:"hostname"`
 		IPAddress    string `json:"ipAddress"`
 		AgentVersion string `json:"agentVersion"`
+		OS           string `json:"os"`
+		Arch         string `json:"arch"`
 	}
 	if err := c.ShouldBindJSON(&input); err != nil {
 		c.JSON(stdhttp.StatusBadRequest, gin.H{"code": "INVALID_INPUT", "message": err.Error()})
 		return
 	}
-	if err := h.service.Heartbeat(c.Request.Context(), input.Token, input.Hostname, input.IPAddress, input.AgentVersion); err != nil {
+	if err := h.service.Heartbeat(c.Request.Context(), input.Token, input.Hostname, input.IPAddress, input.AgentVersion, input.OS, input.Arch); err != nil {
 		response.Error(c, err)
 		return
 	}