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[Sympol]

Description

This PR generalizes the PCM platform infrastructure to ensure full portability and cloud-native resilience. The main objective was to remove tight coupling to specific providers (PostgreSQL, Kafka, Vault) in order to enable provider-agnostic deployments.

Key changes:

• Configuration Independence: Introduction of a decentralized mode with local and environment-variable fallbacks.
• Multi-Database Support: Migration to Hibernate 6 JSON mapping and standardization of Flyway scripts to support both PostgreSQL and MySQL.
• Standardized Observability: Full transition to OpenTelemetry (OTLP) for distributed tracing and metrics.
• Swappable Messaging: Abstraction via Spring Cloud Stream, allowing seamless switching between Kafka and RabbitMQ without code changes.
• Data Protection (PII): Encryption abstraction to support either HashiCorp Vault or a local AES mode.
• Documentation: Updates to the README and QUICKSTART, plus the creation of a PORTABILITY guide and ADR-003.

Fixes # (Infrastructure Abstraction & Portability)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

• Unit Tests
• Integration Tests

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes