feat: 新增「部署客户端」日志采集器模块

三种采集器（host-promtail / k8s-daemonset / k8s-fluentbit-sidecar），每种关联已部署 Loki：
- host-promtail：SSH 安装 Promtail（复用 deployBinary）
- k8s-daemonset：helm 安装 Promtail DaemonSet（复用 deployHelm）
- k8s-fluentbit-sidecar：kubectl patch 注入 Fluent Bit sidecar

含 Collector 数据模型、三个部署器、配置模板、CRUD API、前端页面。
附带 UI 优化：ErrorBoundary、部署卡片浏览器访问按钮、菜单名称调整。

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/types/index.ts

@@ -166,6 +166,40 @@ export interface PageData<T> {
   pageSize: number;
 }
 
+// Collector（日志采集器 / 部署客户端）
+export interface Collector {
+  id: number;
+  name: string;
+  type: 'host-promtail' | 'k8s-daemonset' | 'k8s-fluentbit-sidecar';
+  lokiDeploymentID: number;
+  lokiDeployment?: { id: number; name: string; endpoint: string; status: string };
+  refType: string;
+  hostID?: number;
+  host?: Host;
+  clusterID?: number;
+  cluster?: Cluster;
+  targetDeployment: string;
+  namespace: string;
+  logPath: string;
+  labels: string;
+  status: string;
+  statusMessage: string;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface CreateCollectorRequest {
+  name: string;
+  type: string;
+  lokiDeploymentID: number;
+  hostID?: number;
+  clusterID?: number;
+  targetDeployment?: string;
+  namespace?: string;
+  logPath?: string;
+  labels?: string;
+}
+
 // Dashboard Stats
 export interface DashboardStats {
   totalDeployments: number;