feat(terminal): refactor runtime and add mobile workspace (#2280)

Replace the legacy terminal flow with a shared authenticated WebSocket
runtime used across web, desktop, relay, and mobile surfaces.

- introduce the v3 terminal protocol with scoped attachments, snapshots,
  ordered output, bounded replay history, reconnects, and explicit lifecycle
- harden PTY creation, restart, resize, close, force-kill, idle cleanup,
  shell selection, login mode, environment sanitization, and appearance sync
- add runtime-aware terminal APIs with relay authentication and Electron parity
- add a fullscreen mobile terminal workspace with touch scrolling,
  long-press selection, safe-area controls, quick keys, and Ctrl/Alt input
- add terminal selection attachments, preview detection, project actions,
  shell settings, and localized UI
- harden Ghostty rendering, resize recovery, Unicode handling, block
  characters, line height, and stale-row behavior
- remove the obsolete terminal SSE path and update reverse-proxy guidance
- expand terminal runtime, transport, input, selection, and store coverage
- avoid duplicate web builds when preparing mobile assets in root CI builds

packages/ui/src/lib/i18n/messages/ja.settings.ts

@@ -1761,6 +1761,11 @@ export const settingsDict = {
   'settings.openchamber.visual.field.fontSizePercentageAria': 'フォントサイズの割合',
   'settings.openchamber.visual.actions.resetFontSizeAria': 'フォントサイズをリセット',
   'settings.openchamber.visual.field.terminalFontSize': 'ターミナルフォントサイズ',
+  'settings.openchamber.visual.field.terminalShell': 'ターミナルシェル',
+  'settings.openchamber.visual.field.terminalShellAria': 'ターミナルシェルを選択',
+  'settings.openchamber.visual.field.terminalShellHint': 'この変更を現在のセッションに適用するには、ターミナルを再起動してください。',
+  'settings.openchamber.visual.field.terminalLoginShell': 'ログインシェルとして起動',
+  'settings.openchamber.visual.option.terminalShell.auto': '自動',
   'settings.openchamber.visual.field.editorFontSize': 'エディターフォントサイズ',
   'settings.openchamber.visual.field.codeFont': 'コードフォント',
   'settings.openchamber.visual.field.selectCodeFontAria': 'コードフォントを選択',