Switch web platform memory allocator from mimalloc to dlmalloc.

[jinwuwu001]

将 Web 平台的内存分配器从 mimalloc 切换为 dlmalloc。

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.25%. Comparing base (aef2471) to head (04f81f4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3282      +/-   ##
==========================================
- Coverage   77.26%   77.25%   -0.01%     
==========================================
  Files         415      415              
  Lines       22051    22051              
  Branches     6312     6312              
==========================================
- Hits        17037    17036       -1     
  Misses       3812     3812              
- Partials     1202     1203       +1     

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