feat: sistema de observação por voz - fase 1

- FAB flutuante para gravar observação
- Modal com timer + waveform animado
- Botão sair para desistir
- MediaRecorder API (webm/opus)
- Transcrição via OpenAI Whisper
- Relatório estruturado via GPT
- Salva em .md com frontmatter (data/hora/timestamp)
- Índice JSON para consulta posterior
- Rotas: transcrever, salvar, listar observações
- multer para upload de áudio

node_modules/.package-lock.json

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