feat(k8s): 事件页补全时间/次数/来源等字段

- 后端解析 source/reportingComponent 与 object_kind/name
- 新增 EventTable 统一展示：最后/首次时间、次数、重复跨度、类型、原因、对象、来源、消息
- Deployment 事件 Tab 与事件中心共用表格组件

backend/pkg/kubernetesclient/client.go

@@ -1463,16 +1463,24 @@ type EventList struct {
 	Items []EventItem `json:"items"`
 }
 
+type EventSource struct {
+	Component string `json:"component"`
+	Host      string `json:"host"`
+}
+
 type EventItem struct {
-	Metadata       ObjectMeta     `json:"metadata"`
-	InvolvedObject InvolvedObject `json:"involvedObject"`
-	Type           string         `json:"type"`
-	Reason         string         `json:"reason"`
-	Message        string         `json:"message"`
-	Count          int32          `json:"count"`
-	FirstTimestamp time.Time      `json:"firstTimestamp"`
-	LastTimestamp  time.Time      `json:"lastTimestamp"`
-	EventTime      time.Time      `json:"eventTime"`
+	Metadata            ObjectMeta     `json:"metadata"`
+	InvolvedObject      InvolvedObject `json:"involvedObject"`
+	Type                string         `json:"type"`
+	Reason              string         `json:"reason"`
+	Message             string         `json:"message"`
+	Source              EventSource    `json:"source"`
+	ReportingComponent  string         `json:"reportingComponent"`
+	ReportingInstance   string         `json:"reportingInstance"`
+	Count               int32          `json:"count"`
+	FirstTimestamp      time.Time      `json:"firstTimestamp"`
+	LastTimestamp       time.Time      `json:"lastTimestamp"`
+	EventTime           time.Time      `json:"eventTime"`
 }
 
 type InvolvedObject struct {