build: rebuild llhttp wasm with Node 24 toolchain

[mcollina]

Summary

• rebuild the llhttp wasm artifacts with the Node 24-based wasm builder image
• enable bulk-memory in the wasm-opt step so the newer clang/binaryen toolchain can optimize the generated module
• refresh both standard and SIMD llhttp wasm outputs and their generated JS wrappers

Validation

• rebuilt the llhttp wasm artifacts locally using the new builder image
• verified the generated wrappers load successfully in Node
• confirmed artifact sizes after rebuild:
  • llhttp.wasm: 53777 bytes
  • llhttp_simd.wasm: 53948 bytes

Notes

• this PR does not include the pre-existing local change in test/client-wasm.js

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.90%. Comparing base (2885361) to head (3e38753).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4905      +/-   ##
==========================================
- Coverage   92.90%   92.90%   -0.01%     
==========================================
  Files         112      112              
  Lines       35638    35638              
==========================================
- Hits        33109    33108       -1     
- Misses       2529     2530       +1     

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