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/alert_contacts.go

@@ -0,0 +1,149 @@
+package controller
+
+import (
+	"encoding/json"
+	"net/http"
+	"strconv"
+
+	"ezops/model"
+
+	"github.com/gin-gonic/gin"
+)
+
+// 告警联系人 + 联系组 CRUD（AlertHandler 方法接收者） // Logan.Li
+
+// ==================== 联系人 ====================
+
+// ListContacts GET /alerts/contacts
+func (h *AlertHandler) ListContacts(c *gin.Context) {
+	var contacts []model.AlertContact
+	h.db.Order("created_at DESC").Find(&contacts)
+	c.JSON(http.StatusOK, model.Response{
+		Code:    200,
+		Message: "success",
+		Data:    model.ListResponse{List: contacts, Total: int64(len(contacts))},
+	})
+}
+
+// CreateContact POST /alerts/contacts
+func (h *AlertHandler) CreateContact(c *gin.Context) {
+	var req model.CreateContactRequest
+	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
+	}
+	contact := model.AlertContact{
+		Name:        req.Name,
+		Phone:       req.Phone,
+		Email:       req.Email,
+		ChannelType: req.ChannelType,
+		WebhookURL:  req.WebhookURL,
+	}
+	if err := h.db.Create(&contact).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "创建失败"})
+		return
+	}
+	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "创建成功", Data: contact})
+}
+
+// UpdateContact PUT /alerts/contacts/:id
+func (h *AlertHandler) UpdateContact(c *gin.Context) {
+	id, _ := strconv.Atoi(c.Param("id"))
+	var req model.UpdateContactRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "请求参数错误"})
+		return
+	}
+	var contact model.AlertContact
+	if err := h.db.First(&contact, id).Error; err != nil {
+		c.JSON(http.StatusNotFound, model.Response{Code: 404, Message: "联系人不存在"})
+		return
+	}
+	updates := map[string]interface{}{}
+	if req.Name != "" { updates["name"] = req.Name }
+	if req.Phone != "" { updates["phone"] = req.Phone }
+	if req.Email != "" { updates["email"] = req.Email }
+	if req.ChannelType != "" { updates["channel_type"] = req.ChannelType }
+	if req.WebhookURL != "" { updates["webhook_url"] = req.WebhookURL }
+	h.db.Model(&contact).Updates(updates)
+	h.db.First(&contact, id)
+	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "更新成功", Data: contact})
+}
+
+// DeleteContact DELETE /alerts/contacts/:id
+func (h *AlertHandler) DeleteContact(c *gin.Context) {
+	id, _ := strconv.Atoi(c.Param("id"))
+	if err := h.db.Delete(&model.AlertContact{}, 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"})
+}
+
+// ==================== 联系组 ====================
+
+// ListContactGroups GET /alerts/contact-groups
+func (h *AlertHandler) ListContactGroups(c *gin.Context) {
+	var groups []model.AlertContactGroup
+	h.db.Order("created_at DESC").Find(&groups)
+	c.JSON(http.StatusOK, model.Response{
+		Code:    200,
+		Message: "success",
+		Data:    model.ListResponse{List: groups, Total: int64(len(groups))},
+	})
+}
+
+// CreateContactGroup POST /alerts/contact-groups
+func (h *AlertHandler) CreateContactGroup(c *gin.Context) {
+	var req model.CreateContactGroupRequest
+	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
+	}
+	idsJSON, _ := json.Marshal(req.ContactIDs)
+	group := model.AlertContactGroup{
+		GroupName:  req.GroupName,
+		Notes:      req.Notes,
+		ContactIDs: string(idsJSON),
+	}
+	if err := h.db.Create(&group).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "创建失败"})
+		return
+	}
+	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "创建成功", Data: group})
+}
+
+// UpdateContactGroup PUT /alerts/contact-groups/:id
+func (h *AlertHandler) UpdateContactGroup(c *gin.Context) {
+	id, _ := strconv.Atoi(c.Param("id"))
+	var req model.UpdateContactGroupRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "请求参数错误"})
+		return
+	}
+	var group model.AlertContactGroup
+	if err := h.db.First(&group, id).Error; err != nil {
+		c.JSON(http.StatusNotFound, model.Response{Code: 404, Message: "联系组不存在"})
+		return
+	}
+	updates := map[string]interface{}{}
+	if req.GroupName != "" { updates["group_name"] = req.GroupName }
+	if req.Notes != "" { updates["notes"] = req.Notes }
+	if len(req.ContactIDs) > 0 {
+		idsJSON, _ := json.Marshal(req.ContactIDs)
+		updates["contact_ids"] = string(idsJSON)
+	}
+	h.db.Model(&group).Updates(updates)
+	h.db.First(&group, id)
+	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "更新成功", Data: group})
+}
+
+// DeleteContactGroup DELETE /alerts/contact-groups/:id
+func (h *AlertHandler) DeleteContactGroup(c *gin.Context) {
+	id, _ := strconv.Atoi(c.Param("id"))
+	if err := h.db.Delete(&model.AlertContactGroup{}, 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"})
+}