[Bugfix] Fix incorrect alignment of vectorized subtype

[LeiWang1999]

This pull request makes a minor change to the memory alignment of the fp4_e2_4_t struct in cuda_fp4.h, reducing its alignment from 4 bytes to 2 bytes. This may improve memory efficiency or compatibility with certain data layouts.

• Reduced the alignment of the fp4_e2_4_t struct from 4 bytes to 2 bytes in cuda_fp4.h.

Summary by CodeRabbit

• Bug Fixes
  • Optimized memory alignment for 4-bit floating-point data types to improve performance and memory efficiency in CUDA operations.

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📝 Walkthrough

Walkthrough

The alignment qualifier of the fp4_e2_4_t struct is reduced from 4 bytes to 2 bytes in the CUDA FP4 header file. No functional logic, constructors, or methods are affected.

Changes

Cohort / File(s)	Summary
CUDA FP4 Alignment src/tl_templates/cuda/cuda_fp4.h	Reduced struct alignment from __CUDA_ALIGN__(4) to __CUDA_ALIGN__(2) for fp4_e2_4_t

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• [Refactor] re-implement vector subtype and its access method #1722: Modifies the fp4_e2_4_t structure layout by refactoring its member composition, complementing this alignment change.

Poem

🐰 A struct stands tall with shoulders wide,
Four bytes of padding, side by side.
But now we squeeze with gentle care—
Two bytes align, more compact there! ✨

✨ Finishing touches

• 📝 Generate docstrings

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