fix: ensure @electric-sql/start entrypoint is correct

[icehaunter]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.85%. Comparing base (45ae6c5) to head (64a7c2d).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
packages/start/src/bin.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3642      +/-   ##
==========================================
- Coverage   87.91%   87.85%   -0.07%     
==========================================
  Files          21       22       +1     
  Lines        1821     1820       -1     
  Branches      463      464       +1     
==========================================
- Hits         1601     1599       -2     
- Misses        218      219       +1     
  Partials        2        2              

Flag	Coverage Δ
packages/experimental	87.73% <ø> (ø)
packages/react-hooks	86.48% <ø> (ø)
packages/start	89.58% <0.00%> (-0.08%)	⬇️
packages/typescript-client	93.58% <ø> (-0.09%)	⬇️
packages/y-electric	56.05% <ø> (ø)
typescript	87.85% <0.00%> (-0.07%)	⬇️
unit-tests	87.85% <0.00%> (-0.07%)	⬇️

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