feat: add PhpOffice document and OneDrive tools

[FredPeal]

Summary

• add Word document generation through Neuron PhpOffice tools
• add reusable OneDrive upload and sharing services using Microsoft Graph
• resolve Microsoft Graph credentials company-first, then app fallback

Validation

• PHP syntax checks
• PHPStan
• Composer validation
• local document_id-to-file smoke test

RAG experiments are not included.