feat: implement diskless AES-256-GCM server-side document encryption …

[whitezaddy]

…and IPFS pinning matrix

Closes #145

Description

This Pull Request satisfies the security compliance specifications by designing an isolated, server-side document upload encryption and decentralized IPFS pinning matrix that bypasses the local disk storage entirely.

Core Changes

• In-Memory AES-256-GCM Encryption: Built an isolated crypto.ts utility using authenticated encryption models to safeguard buffers before outbound transfer hooks.
• Diskless Multi-part Form Pipelines: Tied multer memory arrays into the controller network to stream binary payloads straight up to the decentralized pinning gateways.
• Round-Trip Integrity Validation: Implemented comprehensive unit tests to assert cryptographic fidelity, tracking authentic string extraction while maintaining pristine environment key isolation boundaries.

Type of change

• Bug fix
• New feature
• Documentation update
• Other

Checklist

• I have read the contributing guidelines
• My changes pass all targeted local isolation test modules
• Code conforms cleanly to repository linting formats