mysql - fix: resolve TypeScript errors

[jaredwray]

Summary

• type the flattened setMany() values as mysql2 SqlValue entries at the formatting boundary
• add the explicit .js extension required by NodeNext for the KeyvMysqlOptions type re-export

Why

A strict TypeScript check failed because the unconstrained bulk-entry generic was not assignable to mysql2's formatter input type, and the relative type export omitted the runtime extension required by NodeNext module resolution. The bundler transpiled successfully, which allowed both errors to go unnoticed.

Impact

This is a type-only compatibility fix. It does not change the generated SQL or runtime adapter behavior.

Validation

• tsc -p storage/mysql/tsconfig.json --noEmit
• strict TypeScript check covering MySQL tests and migration script
• tsdown --config storage/mysql/tsdown.config.ts
• biome check storage/mysql/src/index.ts
• MySQL integration suite: 118 tests passed

[gemini-code-assist]

Code Review

This pull request updates storage/mysql/src/index.ts by casting flatValues to mysql.SqlValue[] in the mysql.format call to resolve type issues, and appends the .js extension to the relative import of KeyvMysqlOptions. There are no review comments, so I have no feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (49ed583) to head (88ec574).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2011   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           55        55           
  Lines         4887      4887           
  Branches       779       784    +5     
=========================================
  Hits          4887      4887           

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