feat: implement structured logging globally

[heitorrsdev]

Description

Implemented global structured logging replacing the default NestJS console logger with nestjs-pino.

What was done

• Added nestjs-pino and pino-http dependencies
• Configured JSON output for production and pretty-printing for local environments
• Implemented automatic PII Masking (e.g., passwords, emails, tokens)
• Enforced correlation ID tracing for request context tracking
• Drafted ADR 0015 detailing the architectural decision around logging

Why

Standard console.log methods are synchronous, lack JSON formatting necessary for scalable cloud ingestion (like Datadog), and pose security risks by potentially leaking sensitive credentials. Using Pino addresses all formatting, performance, and security-compliance concerns natively.