feat: GUI /memory page + disk/date_math/sleep_timer packs (10 new commands)

GUI: Memory management completes the management trio (/macros + /scheduler + /memory).

Tauri commands (crates/jarvis-gui/src/tauri_commands/memory.rs)
  - memory_list             → Vec<MemoryFact{key, value, created_at, last_used_at, use_count}>
  - memory_remember(k, v)   → persist new fact (or overwrite)
  - memory_forget(key)      → delete by exact key
  - memory_search(q, limit) → substring search

GUI /memory page (frontend/src/routes/memory/index.svelte)
  - Top: add-fact form (key + value inputs + "+Добавить" button)
  - Substring filter input for the list
  - Per-card: key + use_count badge + value (highlighted box) + timestamps +
    "Забыть" button with confirm() guard
  - Auto-sorted by recency (last_used_at desc)
  - Empty state shows voice-hint: 'скажи Jarvis-у "запомни что я люблю чай улун"'

Header (frontend/src/components/Header.svelte)
  - New "Память" button between /scheduler and /settings.
  - i18n: header-memory in ru/en/ua FTL files.

New voice packs

resources/commands/disk/ (2 cmds)
  - disk.free      "сколько свободно на диске" / "сколько места на диске C"
                   PowerShell Get-PSDrive → speaks "Свободно X ГБ из Y, это N%"
  - disk.list      "какие у меня диски" → "C 120 ГБ, D 300 ГБ, E 50 ГБ"

resources/commands/date_math/ (2 cmds)
  - date.days_until    "сколько дней до нового года" / "сколько до 8 марта" /
                       "сколько до 15 марта" — recognises Russian months,
                       holidays (Новый год, Рождество, 8 марта, 9 мая).
                       Auto-rolls to next year if target already passed.
                       Russian-grammar pluralisation (день/дня/дней).
  - date.day_of_week   "какой сегодня день недели" — Zeller's congruence,
                       maps to ru day name.

resources/commands/sleep_timer/ (3 cmds)
  - sleep_timer.pause_in    "выключи музыку через 30 минут"
                            → scheduler one-shot lua action that fires media
                            VK_MEDIA_PLAY_PAUSE via the existing media_keys helper.
                            (Auto-generates _fire_pause.lua wrapper if missing.)
  - sleep_timer.shutdown_in "выключи компьютер через 1 час"
                            → shutdown.exe /s /t <secs>. Caps at 24 hours.
                            Speaks "Скажите 'отмени таймер' чтобы передумать."
  - sleep_timer.cancel      "отмени таймер выключения" / "не выключай компьютер"
                            → shutdown /a + scheduler.remove("sleep_timer_pause"),
                            idempotent.

Pack count: 64 → 67. Tests: 112/112 pass.
Build: cargo build --release -p jarvis-gui green.

resources/commands/sleep_timer/pause_in.lua

@@ -0,0 +1,58 @@
+-- "Выключи музыку через 30 минут" → scheduler one-shot фраза-команда "пауза"
+local phrase = (jarvis.context.phrase or ""):lower()
+local n_str, unit = phrase:match("(%d+)%s+(%S+)")
+if not n_str then
+    return jarvis.cmd.error("Не понял через сколько.")
+end
+local n = tonumber(n_str)
+local secs
+if unit:match("^минут") then secs = "in " .. n .. " minutes"
+elseif unit:match("^час") then secs = "in " .. n .. " hours"
+elseif unit:match("^секунд") then secs = "in " .. n .. " seconds"
+else
+    return jarvis.cmd.error("Не понял единицу.")
+end
+
+-- Build path to media_keys/_media.ps1 (lives next door)
+local cmd_path = jarvis.context.command_path
+local helper = cmd_path:gsub("sleep_timer$", "media_keys") .. "\\_media.ps1"
+helper = helper:gsub("/", "\\")
+
+-- VK_MEDIA_PLAY_PAUSE = 0xB3 = 179
+local lua_path = cmd_path:gsub("\\", "/") .. "/_pause_lua.lua"
+-- Simpler: just speak "пауза" and let agent router handle it? No — agent
+-- router only fires for unmatched commands. Better: directly invoke media key
+-- via a one-shot Lua script.
+
+local script_path = cmd_path .. "\\_fire_pause.lua"
+script_path = script_path:gsub("/", "\\")
+
+-- Write the helper script once
+local exists = jarvis.fs.is_file(script_path)
+if not exists then
+    jarvis.fs.write(script_path, string.format([[
+local helper = "%s"
+jarvis.system.exec(string.format(
+    'powershell -NoProfile -ExecutionPolicy Bypass -File "%%s" 179',
+    helper
+))
+return { chain = false }
+]], helper:gsub("\\", "\\\\")))
+end
+
+local ok, err = pcall(function()
+    jarvis.scheduler.remove("sleep_timer_pause")
+    jarvis.scheduler.add({
+        id = "sleep_timer_pause",
+        name = "Sleep timer: pause music",
+        schedule = secs,
+        action = { type = "lua", script_path = script_path },
+    })
+end)
+
+if not ok then
+    jarvis.log("warn", "sleep_timer.pause_in: " .. tostring(err))
+    return jarvis.cmd.error("Не получилось.")
+end
+
+return jarvis.cmd.ok("Поставлю на паузу через " .. n_str .. " " .. unit .. ".")