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Fix varLayout assertion failure when importing module with global ConstantBuffer (#701)

* Fix varLayout assertion when importing module with global ConstantBuffer

ShaderProgram::init() creates a composite component type from module and entry points but never calls link() on it. When the Slang compiler later performs layout reflection or code generation on this unlinked composite, it hits an internal assertion because variable layout information has not been resolved.

- Call link() after createCompositeComponentType in SingleProgram path
- Add defensive null checks for getElementVarLayout/getContainerVarLayout in Vulkan, WGPU, and D3D12 backend layout code
- Add test for imported module with global ConstantBuffer

* Refactor ShaderProgram initialization logic and simplify test case for imported constant buffer

* Remove fastpath for non-entry shader in shader.cpp and omit CPU from imported constant buffer testing

* Fix loadProgram API contract and re-enable shader fast-path

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