Remove unused compiled_url_patterns variable

[adamtheturtle]

Remove the compiled_url_patterns set from MockVWS.__enter__. It was accumulated across both route-processing loops but never read, so it served no purpose. Also removes the now-unused Iterable and TYPE_CHECKING imports.

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Note

Low Risk
Pure cleanup: removes an unused local variable and related typing-only imports without changing request routing behavior.

Overview
Removes the unused compiled_url_patterns set from MockVWS.__enter__, which was previously accumulated while registering VWS/VWQ route callbacks but never read.

Cleans up imports accordingly by dropping TYPE_CHECKING/Iterable (and related scaffolding), leaving route registration behavior unchanged.

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