Add log/run script for grow-ssd runit service

[Copilot]

The grow-ssd service created a log directory but lacked a log/run script, inconsistent with other runit services (bitcoind, lnd) in this codebase.

Changes

• Created files/etc/sv/grow-ssd/log/run: Standard vlogger configuration following existing service pattern
• Updated base/voidlinux.sh: Added installation logic to copy and set permissions for log/run script

# files/etc/sv/grow-ssd/log/run
#!/bin/sh
exec vlogger -t grow-ssd -p daemon

Service output now properly captured via vlogger, useful for debugging partition growth failures.

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