[TPM] Phase 1: Foundation & IPC Structuring

[Vladush]

This phase ensures secrets can safely traverse the system before touching the TPM.

• Secure Memory: Implement SecureBuffer to replace std::basic_string for handling the unsealed password, dodging Small String Optimization (SSO) leaks via mlock() and explicit_bzero().
• IPC Binary Framing: Migrate from space-delimited text to a length-prefixed binary frame for SEAL, RESEAL, and unseal response commands to support passwords with spaces.
• Logging Hardening: Explicitly bypass request debug logging (main.cpp:69) for any secret-bearing payload to prevent syslog leaks.