feat: lock_workstation + screenshot + net_info packs + modernise power pack
Three handy daily-driver packs + cleanup of the oldest power/act.lua.
power pack — added lock_workstation (resources/commands/power/)
- New command id: lock_workstation
- Phrase: "заблокируй компьютер" / "заблокируй пк" / "заблокируй экран"
- Action: rundll32.exe user32.dll,LockWorkStation
- Sandbox: full (needs system.exec)
- act.lua modernised:
* No more inline PowerShell SAPI escape chain — now uses jarvis.speak
(TTS backend abstraction respects user's chosen Piper/SAPI/Silero).
* Returns via jarvis.cmd.ok/error helpers.
* Logged warning for failing cmds without crashing the pack.
* Cleaner per-action `warn` flag controls the "say cancel to abort" hint.
screenshot pack (NEW, resources/commands/screenshot/, 2 commands)
- "сделай скрин" / "сделай скриншот" → screenshot.to_clipboard
Uses [System.Windows.Forms.Clipboard]::SetImage() with a captured Bitmap.
No file artifact, no LLM call — pure capture, fastest path.
- "сохрани скрин" → screenshot.to_file
Saves to ~/Pictures/Screenshots/jarvis-YYYYMMDD-HHMMSS.png.
Creates dir if missing. Notifies with full path.
- Distinct from vision/ pack which captures + describes via LLM.
net_info pack (NEW, resources/commands/net_info/, 3 commands)
- "какая сеть" / "какой wifi" → net.wifi_ssid
Parses `netsh wlan show interfaces` for SSID line (RU + EN field names).
- "мой IP" / "локальный IP" → net.local_ip
PowerShell Get-NetIPAddress, filters out 127.* and 169.* (link-local).
- "внешний IP" / "публичный IP" → net.public_ip
Hits api.ipify.org via jarvis.http.get (no key, plain text).
Tests: 99/99 pass (commands::tests auto-validates new packs).
Build: cargo build --release -p jarvis-app green.
Pack count: 59 → 62 (intro/echo from prior commit + screenshot + net_info; power
already counted — added a command, not a pack).
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