docs: add official Discord server link

[Pedrohs1771]

Preparado pela Lain para o LumaTools.

Resumo

Patch mínimo de documentação: adiciona um badge clicável do Discord nos dois READMEs usando o link oficial fornecido. Escopo limitado a documentação; interface não alterada.

Arquivos

• README.md
• README.pt-br.md

Testes

• PASS git diff --check

Closes #4

Merge e release continuam sujeitos aos gates privados.

[Pedrohs1771]

Ajuste solicitado pela revisão privada da Lain:

arrume perfeito

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