Add new PreventDuplicateHandlingMode (popUntilTargetRoute)

[linpengteng]

Now PreventDuplicateHandlingMode:

Mode	Description	Scenarios
PopUntilOriginalRoute	Return to the original route through the navigation stack	Return to a fixed page (such as the login page)
DoNothing	Ignore the navigation request and do nothing.	Prevent repeated rapid clicks from triggering multiple navigations.
ReorderRoutes (recommended)	Move existing pages to the top of the stack instead of creating them repeatedly.	Ensure page uniqueness, optimize performance, and simplify the stack.

Add new popUntilTargetRoute (Similar to Get.offNamedUntil)

Mode	Description	Scenarios
popUntilTargetRoute	Pop pages from the stack until the target page is found.	Ensure the consistency of the order of routes in the routing stack