refactor(types): move index.d.ts and rename test-types

[Tony133]

Proposal:

• Moved index.d.ts into types/
• Renamed test-types/ to types/
• Updated package.json accordingly
• Kept the existing type tests under the new structure

Note:

• This reorganizes the type definitions and type tests into a single types/ directory, keeping the project structure consistent with the other repositories.

[Tony133]

cc @fastify/typescript

[Copilot]

Pull request overview

This PR reorganizes the TypeScript surface area by moving the package declaration file into types/ and colocating type tests alongside it, updating the package entrypoint for typings accordingly.

Changes:

• Point package.json#types to types/index.d.ts.
• Add/relocate type tests under types/ (query/transaction/initialization/imports).
• Introduce the moved declaration file at types/index.d.ts.

Reviewed changes

Copilot reviewed 2 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
types/transaction.tst.ts	Adds transaction-related type tests, including route-level pg.transact usage.
types/query.tst.ts	Adds query-related type tests for app.pg and pg client/query typing.
types/initialization.tst.ts	Adds type tests for registration variants (native, custom pg, multiple db names, pool options).
types/index.d.ts	Declares Fastify module augmentation and plugin/public API types under the new types/ location.
types/imports.tst.ts	Updates import paths for the new layout and validates import forms.
package.json	Updates the types entry to the new declaration file location.

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