Adds detection and automatic wiring for the WGSL unrestricted_pointer_parameters language feature, following the same pattern as linear_indexing, subgroup_id, and the other WGSL feature caps.

Companion to #8784 — that PR worked around the missing feature by inlining the helper; this PR exposes the cap so future shaders can opt into pointer-of-storage parameters on devices that support it, with a portable fallback path on browsers that don't.

Changes:

• GraphicsDevice.supportsUnrestrictedPointerParameters flag, probed from navigator.gpu.wgslLanguageFeatures in WebgpuGraphicsDevice#initDeviceCaps.

• CAPS_UNRESTRICTED_POINTER_PARAMETERS shader define for conditional compilation (#ifdef).

• requires unrestricted_pointer_parameters; directive automatically injected into WGSL shaders on supporting devices via ShaderDefinitionUtils.getWGSLEnables.

• WebGPU init log extended to list the browser's advertised WGSL language features alongside the GPU feature list. Example:

  WEBGPU (apple / metal-3) features [full]: float32-filterable, ..., subgroups, wgslFeatures(readonly_and_readwrite_storage_textures, packed_4x8_integer_dot_product, unrestricted_pointer_parameters, ...)
  

Notes:

• Infrastructure-only — no shader callers yet. The cap is available for future WGSL helpers that benefit from passing storage/uniform/workgroup pointers across function boundaries.
• Firefox/naga doesn't currently expose this feature; the cap will be false there and no requires directive is emitted, so existing portable shaders continue to compile.