feat: enhance backups page with live data loading and backup job management

Implemented live data fetching for servers and backups on the backups page, replacing static initial data. Added functionality for manual backup creation and job status tracking, including error handling and UI updates. Updated the network map layout to improve node prioritization and visual representation of server roles.

Also, registered new backups API routes in the backend for improved data handling.

shared/api/backups.ts

@@ -0,0 +1,68 @@
+import { requestJson } from "@/shared/api/http-client"
+
+export type BackupItem = {
+  id: string
+  serverId: string
+  serverName: string
+  filename: string
+  sizeBytes: number
+  createdAt: string
+  kind: "manual"
+  notes?: string
+}
+
+type CreateBackupResponse = {
+  created: BackupItem[]
+  failures: Array<{ serverId: string; error: string }>
+}
+
+export type CreateBackupJobResponse = {
+  jobId: string
+  status: "queued" | "running" | "done" | "failed"
+  total: number
+  completed: number
+}
+
+export type BackupJobStatusResponse = {
+  id: string
+  status: "queued" | "running" | "done" | "failed"
+  requestedAt: string
+  startedAt?: string
+  finishedAt?: string
+  total: number
+  completed: number
+  created: BackupItem[]
+  failures: Array<{ serverId: string; error: string }>
+}
+
+export async function listBackups(baseUrl: string): Promise<BackupItem[]> {
+  return requestJson<BackupItem[]>(baseUrl, "/api/backups")
+}
+
+export async function createBackups(
+  baseUrl: string,
+  payload: { serverIds: string[]; notes?: string },
+): Promise<CreateBackupResponse> {
+  return requestJson<CreateBackupResponse>(baseUrl, "/api/backups/create", {
+    method: "POST",
+    body: JSON.stringify(payload),
+  })
+}
+
+export async function createBackupsAsync(
+  baseUrl: string,
+  payload: { serverIds: string[]; notes?: string },
+): Promise<CreateBackupJobResponse> {
+  return requestJson<CreateBackupJobResponse>(baseUrl, "/api/backups/create", {
+    method: "POST",
+    body: JSON.stringify(payload),
+  })
+}
+
+export async function getBackupJob(baseUrl: string, jobId: string): Promise<BackupJobStatusResponse> {
+  return requestJson<BackupJobStatusResponse>(baseUrl, `/api/backups/jobs/${jobId}`)
+}
+
+export async function deleteBackup(baseUrl: string, id: string): Promise<void> {
+  await requestJson<void>(baseUrl, `/api/backups/${id}`, { method: "DELETE" })
+}