feat(watch): retry SSH connection failures with exponential backoff

Remove the vm_api_reachable? filter from run_watch so VMs that are

currently booting are not silently dropped from the dashboard.

Add exponential-backoff retry logic (up to 4 attempts, sleeping

2s, 4s, 8s, 16s) inside VllmWatcher#fetch_vm_stats for transient

SSH/WireGuard errors such as connection refused, host unreachable,

and exit 255. This lets watch automatically recover while a VM

is still starting up instead of failing immediately.

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