[BUG] - Filebrowser fails when using Vault Credentials

Title

Filebrowser fails when using Vault Credentials

Platform

Website - Chrome

Server Installation Method

Proxmox (Community Scripts)

Version

2.7.1

CLI Installation Method

None

CLI Version

No response

Troubleshooting

• I have examined logs and tried to find the issue
• I have reviewed opened and closed issues
• I have tried restarting the application
• I have checked open issues and ensured this is not a duplicate

The Problem

Using Vault Authentication makes it impossible to use the File Browser.
Opening the File Browser fails during auth with:

13:41:47
Initiating SFTP connection to XX@HOST
13:41:47
Resolving authentication credentials
13:41:47
Credentials resolved from server-side host data
13:41:47
No valid authentication method provided
13:41:47
Failed to connect to SSH: Either password or SSH key must be provided```

### How to Reproduce

1. Create a Host or edit a Host to use Vault / a Vault Profile for Auth. 
2. Start an ssh Session to verify it works
3. Start a File Browser Session to receive the SSH Connection Issue

### Additional Context

Aug 28 13:44:33 termix node[1167846]: [1:44:33 PM] [WARN] [📁] No valid authentication method provided for file manager [op:file_connect,host:XX,session:XX]

Start by reproducing the File Browser connection with a Host using Vault or a Vault Profile, then compare its credential-resolution path with the working SSH session. Use the reported file manager warning and SSH authentication error as the initial trace points; done means File Browser can authenticate through Vault credentials without requiring a separate password or SSH key.