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_platform.go

@@ -0,0 +1,132 @@
+package controller
+
+import (
+	"net/http"
+	"strconv"
+	"strings"
+
+	"ezops/model"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+)
+
+// ==================== 云平台（Platform / Cloud）====================
+
+// PlatformHandler 云平台处理器
+type PlatformHandler struct {
+	db *gorm.DB
+}
+
+func NewPlatformHandler(db *gorm.DB) *PlatformHandler {
+	return &PlatformHandler{db: db}
+}
+
+// platformRequest 云平台创建/更新请求
+type platformRequest struct {
+	Name        string `json:"name"`
+	Code        string `json:"code"`
+	Type        string `json:"type"`
+	Status      string `json:"status"`
+	Website     string `json:"website"`
+	Description string `json:"description"`
+}
+
+// ListPlatforms 获取云平台列表
+func (h *PlatformHandler) ListPlatforms(c *gin.Context) {
+	var platforms []model.Cloud
+	h.db.Find(&platforms)
+
+	c.JSON(http.StatusOK, model.Response{
+		Code:    200,
+		Message: "success",
+		Data: model.ListResponse{
+			List:  platforms,
+			Total: int64(len(platforms)),
+		},
+	})
+}
+
+// CreatePlatform 创建云平台
+func (h *PlatformHandler) CreatePlatform(c *gin.Context) {
+	var req platformRequest
+	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: "平台名称和编码不能为空"})
+		return
+	}
+
+	cloudType := strings.TrimSpace(req.Type)
+	if cloudType == "" {
+		cloudType = "public"
+	}
+	status := strings.TrimSpace(req.Status)
+	if status == "" {
+		status = "active"
+	}
+
+	platform := model.Cloud{
+		Name:        strings.TrimSpace(req.Name),
+		Code:        strings.TrimSpace(req.Code),
+		Type:        cloudType,
+		Status:      status,
+		Website:     req.Website,
+		Description: req.Description,
+	}
+	if err := h.db.Create(&platform).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: platform})
+}
+
+// UpdatePlatform 更新云平台
+func (h *PlatformHandler) UpdatePlatform(c *gin.Context) {
+	id, _ := strconv.Atoi(c.Param("id"))
+	var req platformRequest
+	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 platform model.Cloud
+	if err := h.db.First(&platform, id).Error; err != nil {
+		c.JSON(http.StatusNotFound, model.Response{Code: 404, Message: "云平台不存在"})
+		return
+	}
+
+	if strings.TrimSpace(req.Name) != "" {
+		platform.Name = strings.TrimSpace(req.Name)
+	}
+	if strings.TrimSpace(req.Code) != "" {
+		platform.Code = strings.TrimSpace(req.Code)
+	}
+	if strings.TrimSpace(req.Type) != "" {
+		platform.Type = strings.TrimSpace(req.Type)
+	}
+	if strings.TrimSpace(req.Status) != "" {
+		platform.Status = strings.TrimSpace(req.Status)
+	}
+	platform.Website = req.Website
+	platform.Description = req.Description
+
+	if err := h.db.Save(&platform).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: platform})
+}
+
+// DeletePlatform 删除云平台
+func (h *PlatformHandler) DeletePlatform(c *gin.Context) {
+	id, _ := strconv.Atoi(c.Param("id"))
+	if err := h.db.Delete(&model.Cloud{}, 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"})
+}
+