feat(commands): add media controls + system info packs

media/ — play_pause, next, prev, stop via user32!keybd_event (VK_MEDIA_*
0xB0..0xB3). Helper _media_helper.ps1 mirrors the volume/ pack pattern,
so the same C# P/Invoke style works for the four standard media keys
without needing any external tooling. Catches Spotify, foobar, browsers,
Yandex Music PWA — anything that responds to system media keys.

sysinfo/ — battery / time / cpu / ram / disk and an "all" combo.
_sysinfo.ps1 uses CIM queries (Win32_Battery, Win32_OperatingSystem,
Win32_LogicalDisk, Win32_Processor + Win32_PerfFormattedData_PerfOS_
Processor) — no external deps. Time is rendered in ru-RU culture
("01:17, 15 мая, пятница"). Battery falls back to a friendly "no
battery, looks like a desktop" when Win32_Battery is empty. SystemDrive
env var resolves the right disk on non-C:/ installs.

Each sysinfo command notifies the line as a Windows toast and logs it.

Triggered locally: sysinfo_all currently reports:
  Сейчас: 01:17, 15 мая, пятница
  Батарея не обнаружена (видимо, десктоп)
  CPU: AMD Ryzen 7 5700X3D 8-Core Processor, загрузка 4%
  RAM: 23.4 из 47.9 ГБ (49% занято)
  Диск C:: свободно 118.2 из 1906.8 ГБ

Total command packs is now 9 (verified via jarvis-gui startup log).

Portability: all PowerShell helpers use $env:SystemDrive and CIM
classes that ship with every Windows install; Lua wrappers resolve
the helper path via jarvis.context.command_path (no hardcoded user
profile paths or absolute C:\ refs).

resources/commands/media/_media_helper.ps1

@@ -0,0 +1,20 @@
+param(
+    [Parameter(Mandatory=$true)]
+    [ValidateSet("play_pause","next","prev","stop")]
+    [string]$Action
+)
+
+Add-Type -Name MediaKey -Namespace Win32 -MemberDefinition @'
+[DllImport("user32.dll")]
+public static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, System.UIntPtr dwExtraInfo);
+'@
+
+$vk = switch ($Action) {
+    "play_pause" { 0xB3 }
+    "next"       { 0xB0 }
+    "prev"       { 0xB1 }
+    "stop"       { 0xB2 }
+}
+
+[Win32.MediaKey]::keybd_event($vk, 0, 0, [UIntPtr]::Zero)
+[Win32.MediaKey]::keybd_event($vk, 0, 2, [UIntPtr]::Zero)

resources/commands/media/command.toml

@@ -0,0 +1,103 @@
+[[commands]]
+id = "media_play_pause"
+type = "lua"
+script = "play_pause.lua"
+sandbox = "full"
+timeout = 3000
+
+[commands.phrases]
+ru = [
+    "пауза",
+    "поставь на паузу",
+    "продолжи",
+    "включи музыку",
+    "запусти музыку",
+    "плей",
+]
+en = [
+    "pause",
+    "play",
+    "resume",
+    "play music",
+]
+ua = [
+    "пауза",
+    "продовж",
+    "включи музику",
+]
+
+
+[[commands]]
+id = "media_next"
+type = "lua"
+script = "next_track.lua"
+sandbox = "full"
+timeout = 3000
+
+[commands.phrases]
+ru = [
+    "следующий трек",
+    "следующая песня",
+    "переключи трек",
+    "следующая",
+    "дальше",
+]
+en = [
+    "next track",
+    "next song",
+    "skip",
+    "next",
+]
+ua = [
+    "наступний трек",
+    "наступна пісня",
+    "далі",
+]
+
+
+[[commands]]
+id = "media_prev"
+type = "lua"
+script = "prev_track.lua"
+sandbox = "full"
+timeout = 3000
+
+[commands.phrases]
+ru = [
+    "предыдущий трек",
+    "предыдущая песня",
+    "верни песню",
+    "назад",
+]
+en = [
+    "previous track",
+    "previous song",
+    "back",
+]
+ua = [
+    "попередній трек",
+    "назад",
+]
+
+
+[[commands]]
+id = "media_stop"
+type = "lua"
+script = "stop_media.lua"
+sandbox = "full"
+timeout = 3000
+
+[commands.phrases]
+ru = [
+    "стоп музыка",
+    "останови музыку",
+    "выключи музыку",
+]
+en = [
+    "stop music",
+    "stop playback",
+]
+ua = [
+    "стоп музика",
+    "вимкни музику",
+]

resources/commands/media/next_track.lua

@@ -0,0 +1,13 @@
+local helper = jarvis.context.command_path .. "\\_media_helper.ps1"
+local cmd = string.format(
+    'powershell -NoProfile -ExecutionPolicy Bypass -File "%s" -Action next',
+    helper
+)
+local res = jarvis.system.exec(cmd)
+if res.success then
+    jarvis.audio.play_ok()
+else
+    jarvis.log("error", "media next failed: " .. tostring(res.stderr))
+    jarvis.audio.play_error()
+end
+return { chain = false }

resources/commands/media/play_pause.lua

@@ -0,0 +1,13 @@
+local helper = jarvis.context.command_path .. "\\_media_helper.ps1"
+local cmd = string.format(
+    'powershell -NoProfile -ExecutionPolicy Bypass -File "%s" -Action play_pause',
+    helper
+)
+local res = jarvis.system.exec(cmd)
+if res.success then
+    jarvis.audio.play_ok()
+else
+    jarvis.log("error", "play/pause failed: " .. tostring(res.stderr))
+    jarvis.audio.play_error()
+end
+return { chain = false }

resources/commands/media/prev_track.lua

@@ -0,0 +1,13 @@
+local helper = jarvis.context.command_path .. "\\_media_helper.ps1"
+local cmd = string.format(
+    'powershell -NoProfile -ExecutionPolicy Bypass -File "%s" -Action prev',
+    helper
+)
+local res = jarvis.system.exec(cmd)
+if res.success then
+    jarvis.audio.play_ok()
+else
+    jarvis.log("error", "media prev failed: " .. tostring(res.stderr))
+    jarvis.audio.play_error()
+end
+return { chain = false }

resources/commands/media/stop_media.lua

@@ -0,0 +1,13 @@
+local helper = jarvis.context.command_path .. "\\_media_helper.ps1"
+local cmd = string.format(
+    'powershell -NoProfile -ExecutionPolicy Bypass -File "%s" -Action stop',
+    helper
+)
+local res = jarvis.system.exec(cmd)
+if res.success then
+    jarvis.audio.play_ok()
+else
+    jarvis.log("error", "media stop failed: " .. tostring(res.stderr))
+    jarvis.audio.play_error()
+end
+return { chain = false }