chore: refactor vitest usage, ts config, shuffle dependencies

[josefaidt]

Motivation and Context

ref #1537, item 2 and 12

The vitest setup can benefit from exporting the TypeScript-based config directly, and consumed with type-safety in consuming packages. This PR:

1. renames all occurrences of vitest.config.js to vitest.config.ts
2. removes unused main export pointing to vitest.config.mjs in shared package
3. removes vitest/globals from shared tsconfig -- overriding TypeScript's default type resolution behavior
4. creates env.d.ts in each consuming package (this can also be made more specific to just the tests by creating a separate tsconfig for test files, that way vitest/globals aren't polluting the global namespace of source files -- happy to make this adjustment)
5. removes vitest from the root package.json as it is unneeded

How Has This Been Tested?

re-ran pnpm test:all to ensure tests are still running and completing successfully

Breaking Changes

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

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commit: 0dcbb06

[josefaidt]

ah this is failing because the module resolution is set to NodeNext instead of bundler, but I'll cover that in a separate PR with an adjustment to the tsconfig usage and sharing