fix: forbid re-init mp

[zwwill]

No description provided.

[codecov-io]

Codecov Report

Merging #17 into feature_megalo will increase coverage by 0.01%.
The diff coverage is 100%.

@@                Coverage Diff                 @@
##           feature_megalo      #17      +/-   ##
==================================================
+ Coverage            91.3%   91.31%   +0.01%     
==================================================
  Files                  45       45              
  Lines                1529     1532       +3     
==================================================
+ Hits                 1396     1399       +3     
  Misses                133      133

Impacted Files	Coverage Δ
src/platforms/mp/runtime/index.js	100% <100%> (ø)	⬆️

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