feat(audit): F1+F2 告警静默规则标记完成 + 审计日志CSV导出实现

F1 告警静默规则 [done]:
- 后端 alert_silence.go: CRUD + Toggle (onetime/daily/weekly 三模式)
- 告警引擎 isSilenced 集成 (alert_engine.go)
- 前端 SilenceRuleTab + SilenceDialog
- 路由 /alerts/silences 已注册

F2 审计日志导出 [done]:
- 重写 ExportAuditLogs: 真正的 CSV 导出 (encoding/csv + UTF-8 BOM)
- 支持 module/action/username/startTime/endTime 筛选
- 导出限制 10000 条防溢出，自动记录审计日志
- JSON 格式向后兼容 (format=json)
- 前端 exportLogs 传递查询参数

同时包含累积的前期工作:
- 目录重构 internal/ -> controller/model/router (v0.55-v0.57)
- 后端分层架构 dto/repository/service/utils
- 审计模块全功能 (终端审计/操作审计/登录日志)
- asciicast v2 录制格式
- SFTP 文件浏览器
- StatStrip 紧凑统计条
- 在线会话自动刷新
- LiveMonitor WebSocket 诊断修复

验证: go build ✅ | npm run build ✅ | Docker 部署 ✅ | 10 回归端点 ✅ | CSV 导出 ✅ | 静默 CRUD ✅

backend/controller/cloud_region.go

@@ -0,0 +1,151 @@
+package controller
+
+import (
+	"net/http"
+	"strconv"
+	"strings"
+
+	"ezops/model"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+)
+
+// ==================== 区域管理（Region）====================
+
+// RegionHandler 区域处理器
+type RegionHandler struct {
+	db *gorm.DB
+}
+
+func NewRegionHandler(db *gorm.DB) *RegionHandler {
+	return &RegionHandler{db: db}
+}
+
+// regionRequest 区域创建/更新请求
+type regionRequest struct {
+	Name     string `json:"name"`
+	Code     string `json:"code"`
+	Provider string `json:"provider"`
+	Location string `json:"location"`
+	Status   string `json:"status"`
+	Endpoint string `json:"endpoint"`
+}
+
+// ListRegions 获取区域列表
+func (h *RegionHandler) ListRegions(c *gin.Context) {
+	var regions []model.Region
+	h.db.Find(&regions)
+
+	c.JSON(http.StatusOK, model.Response{
+		Code:    200,
+		Message: "success",
+		Data: model.ListResponse{
+			List:  regions,
+			Total: int64(len(regions)),
+		},
+	})
+}
+
+// CreateRegion 创建区域
+func (h *RegionHandler) CreateRegion(c *gin.Context) {
+	var req regionRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "请求参数错误: " + err.Error()})
+		return
+	}
+	if strings.TrimSpace(req.Name) == "" || strings.TrimSpace(req.Code) == "" {
+		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "区域名称和编码不能为空"})
+		return
+	}
+
+	status := strings.TrimSpace(req.Status)
+	if status == "" {
+		status = "active"
+	}
+
+	region := model.Region{
+		Name:     strings.TrimSpace(req.Name),
+		Code:     strings.TrimSpace(req.Code),
+		Provider: strings.TrimSpace(req.Provider),
+		Location: req.Location,
+		Status:   status,
+		Endpoint: req.Endpoint,
+	}
+	if err := h.db.Create(&region).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "创建失败，编码可能已存在"})
+		return
+	}
+	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "创建成功", Data: region})
+}
+
+// UpdateRegion 更新区域
+func (h *RegionHandler) UpdateRegion(c *gin.Context) {
+	id, _ := strconv.Atoi(c.Param("id"))
+	var req regionRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "请求参数错误: " + err.Error()})
+		return
+	}
+
+	var region model.Region
+	if err := h.db.First(&region, id).Error; err != nil {
+		c.JSON(http.StatusNotFound, model.Response{Code: 404, Message: "区域不存在"})
+		return
+	}
+
+	if strings.TrimSpace(req.Name) != "" {
+		region.Name = strings.TrimSpace(req.Name)
+	}
+	if strings.TrimSpace(req.Code) != "" {
+		region.Code = strings.TrimSpace(req.Code)
+	}
+	if strings.TrimSpace(req.Provider) != "" {
+		region.Provider = strings.TrimSpace(req.Provider)
+	}
+	region.Location = req.Location
+	if strings.TrimSpace(req.Status) != "" {
+		region.Status = strings.TrimSpace(req.Status)
+	}
+	region.Endpoint = req.Endpoint
+
+	if err := h.db.Save(&region).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "更新失败"})
+		return
+	}
+	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "更新成功", Data: region})
+}
+
+// DeleteRegion 删除区域
+func (h *RegionHandler) DeleteRegion(c *gin.Context) {
+	id, _ := strconv.Atoi(c.Param("id"))
+	if err := h.db.Delete(&model.Region{}, id).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "删除失败"})
+		return
+	}
+	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "删除成功"})
+}
+
+// BatchDeleteRegions 批量删除区域 // Logan.Li
+// @Summary 批量删除区域
+// @Description 批量删除区域
+// @Tags 云区域
+// @Accept json
+// @Produce json
+// @Security Bearer
+// @Param request body model.IDsRequest true "删除请求"
+// @Success 200 {object} model.Response
+// @Router /regions/batch-delete [delete]
+func (h *RegionHandler) BatchDeleteRegions(c *gin.Context) {
+	var req model.IDsRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "请求参数错误"})
+		return
+	}
+
+	if err := h.db.Delete(&model.Region{}, req.IDs).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "删除失败"})
+		return
+	}
+	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "删除成功"})
+}