Enhance SandwichReminder-AutoOrder feature with direct checkout navigation and improved logic

- Added new configuration options for direct checkout navigation, including `useDirectCheckoutNavigation`, `checkoutPath`, and `checkoutOpenDelayMs`.
- Updated the auto-order flow to navigate directly to the checkout page, skipping the mini-cart and date/time steps.
- Improved keyboard automation logic for item remark and order confirmation processes.
- Removed the old SandwichAutoOrder.ps1 file as its functionality has been integrated into SandwichReminder-AutoOrder.ps1.
- Introduced a new runner-launcher.vbs to start the runner.ps1 without a visible console window, ensuring WinForms dialogs can appear.
- Implemented a mutex mechanism in runner.ps1 to prevent concurrent execution of the same feature.

internal/runner-launcher.vbs

@@ -0,0 +1,25 @@
+' runner-launcher.vbs
+' Starts runner.ps1 without a visible console window.
+' Uses a shown/minimized style (not 0) so the process joins the interactive window station,
+' which is required for WinForms dialogs to appear. PowerShell's own
+' -WindowStyle Hidden suppresses the console window.
+
+Option Explicit
+
+If WScript.Arguments.Count < 1 Then
+    WScript.Quit 1
+End If
+
+Dim runnerPath
+runnerPath = WScript.Arguments(0)
+
+Dim shell, cmd
+Set shell = CreateObject("WScript.Shell")
+cmd = "powershell.exe -NoLogo -NoProfile -Sta -WindowStyle Hidden -ExecutionPolicy Bypass -File """ & runnerPath & """"
+
+' Window style 1 = SW_SHOWNORMAL — do NOT use 0 here.
+' Style 0 (CREATE_NO_WINDOW) detaches the process from the interactive
+' window station, which prevents WinForms dialogs from rendering.
+' PowerShell's own -WindowStyle Hidden flag suppresses the console window.
+shell.Run cmd, 1, False
+WScript.Quit 0