vulkan: Improve memory allocation robustness

Enhances the Vulkan memory allocator with better OOM handling and memory
alignment:

* Add memory recovery by cleaning up empty allocations before failing
* Implement proper fallback to non-device-local memory
* Simplify memory alignment handling for different vendors
* Add better error logging for allocation failures
* Add IsEmpty() helper to track unused allocations
* Fix alignment requirements for Adreno (4KB) vs other vendors

These changes improve the robustness of memory allocation, particularly
in low-memory situations, and streamline vendor-specific alignment
requirements.

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