Add LXC container backup functionality

- Add backup capability before updates or as standalone action
- Implement storage service to fetch and parse backup-capable storages from PVE nodes
- Add backup storage selection modal for user choice
- Support backup+update flow with sequential execution
- Add standalone backup option in Actions menu
- Add storage viewer in server section to show available storages
- Parse /etc/pve/storage.cfg to identify backup-capable storages
- Cache storage data for performance
- Handle backup failures gracefully (warn but allow update to proceed)

src/server/api/routers/installedScripts.ts

@@ -4,7 +4,6 @@ import { getDatabase } from "~/server/database-prisma";
 import { createHash } from "crypto";
 import type { Server } from "~/types/server";
 import { getStorageService } from "~/server/services/storageService";
-import { SSHService } from "~/server/ssh-service";
 
 // Helper function to parse raw LXC config into structured data
 function parseRawConfig(rawConfig: string): any {
@@ -2063,6 +2062,7 @@ EOFCONFIG`;
         }
 
         const storageService = getStorageService();
+        const { default: SSHService } = await import('~/server/ssh-service');
         const sshService = new SSHService();
         
         // Test SSH connection first
@@ -2118,6 +2118,7 @@ EOFCONFIG`;
           };
         }
 
+        const { default: SSHService } = await import('~/server/ssh-service');
         const sshService = new SSHService();
         
         // Test SSH connection first