refactor: use Node.js native type striping

[fraxken]

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[Copilot]

Pull request overview

This PR refactors the codebase to leverage Node.js native TypeScript type stripping capabilities, eliminating the need for separate build tools. The changes modernize the development workflow and dependencies while maintaining the same API surface.

Key changes:

• Migrated from @myunisoft/httpie to native undici for HTTP requests
• Split monolithic src/index.ts into separate files for better organization (api.ts and github.types.ts)
• Updated TypeScript configuration to use @openally/config.typescript/esm-ts-next for native type stripping support
• Simplified build and test scripts to use native Node.js capabilities (node --test)

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tsconfig.json	Updated TypeScript configuration to extend ESM-TS-Next config for native type stripping
test/fetch.spec.ts	Changed import extension from .js to .ts to support native type stripping
src/index.ts	Refactored to re-export from modularized files instead of containing all logic
src/github.types.ts	New file containing exported TypeScript interfaces for GitHub API types
src/api.ts	New file containing main API logic with migrated HTTP client from httpie to undici
package.json	Updated dependencies, removed build tools (tsx, rimraf, glob), simplified scripts, added exact version constraints
.npmrc	Added ignore-scripts and save-exact configuration flags
.github/workflows/node.js.yml	Updated Node.js version to 24.x and added --ignore-scripts flag to install command
.github/dependabot.yml	Added cooldown configuration with 5-day default for both npm and GitHub Actions updates

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