This PR adds a "New Terminal" option to the system right-click menus across all platforms:

• Windows: Taskbar Jump List
• macOS: Dock right-click menu
• Linux: Desktop file actions

The "New Terminal" entry is positioned below the existing "New Window" entry on all platforms and provides users with quick access to VS Code's integrated terminal directly from the system interface.

Implementation Details

macOS Dock Menu

• Added "New Terminal" menu item that directly executes the workbench.action.terminal.new command
• Uses the existing runActionInRenderer method to send the command to the active window
• If no window is active, creates a new window with a terminal

Windows Jump List

• Added "New Terminal" task entry to the taskbar Jump List
• Opens a new VS Code window where users can quickly access the terminal via Ctrl+` or the View menu
• Uses the same launch arguments as "New Window" but with terminal-focused labeling

Linux Desktop Integration

• Extended code.desktop file with a new "new-terminal" action
• Includes localized names for all supported languages (Czech, German, Spanish, French, Italian, Japanese, Korean, Russian, Simplified Chinese, Traditional Chinese)
• Opens a new window following the same pattern as the existing "New Empty Window" action

User Experience

This enhancement provides users with quick access to VS Code's integrated terminal directly from the system taskbar/dock/desktop, improving workflow efficiency for developers who frequently use the terminal.

Before: Users had to open VS Code first, then open the terminal panel
After: Users can quickly access terminal functionality with a single right-click from the system interface

Fixes #258813.

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