chore: use shared TypeScript config

[jan-kubica]

Summary

• allow the Stella shared TypeScript config through Bun's release-age quarantine
• add @stll/typescript-config and extend the shared library preset
• keep stdnum-specific path aliases and included config files local

Validation

• bun run typecheck
• bun run lint
• bun run format:check
• bun run build
• bun run test

[gemini-code-assist]

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