fix(vulkan): vkDestroyDevice memory leak

## Problem
Device is not properly destroyed due to missing goffi signature for `vkDestroyDevice`.

## Location
`hal/vulkan/adapter.go:199`

## Impact
Minor memory leak when creating/destroying devices multiple times.

## Solution
Update goffi signature to support `vkDestroyDevice(VkDevice, VkAllocationCallbacks*)`.

## Priority
P1 - Fix in v0.4.1