fix: daemon service description in linux should place `$USER` instead of `username`

[AnnatarHe]

fix: daemon service description in linux should place $USER instead of username

model/sys-desc/shelltime.service:7

@claude do it

[claude]

Claude finished @AnnatarHe's task —— View job • claude/issue-132-20251006-1213 • Create PR ➔

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All done! ✓

• Read the systemd service file to understand the issue
• Fix line 7 to use $USER instead of hardcoded username
• Commit and push the changes
• Provide PR creation link

Fixed the systemd service file to use $USER instead of the hardcoded username string. This allows the service to dynamically resolve the current user's shell instead of looking up a user literally named "username".

Changes:

• model/sys-desc/shelltime.service:7 - Updated getent passwd username to getent passwd $USER

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