feat: add GPU shader cache cleanup (NVIDIA, AMD, Intel, DirectX)

Add Clear-GPUShaderCaches function to clean GPU shader caches:
- NVIDIA: DXCache, GLCache, NV_Cache
- AMD: DXCache, GLCache, VkCache
- Intel: ShaderCache
- DirectX: D3DSCache, DirectX Shader Cache
- Vulkan: VulkanCache (pipeline cache)

These caches can grow to 10GB+ and are safe to delete.
They will be rebuilt automatically when needed.

Integrated into main clean.ps1 workflow.

bin/clean.ps1

@@ -230,6 +230,9 @@ function Start-Cleanup {
         # Browser caches
         Clear-BrowserCaches
 
+        # GPU shader caches (NVIDIA, AMD, Intel, DirectX)
+        Clear-GPUShaderCaches
+
         # Application caches
         Clear-AppCaches