Implemented docker-compose orchestration for Fluxora-Backend

[Adedayo-Data]

Description

This PR introduces an operator-grade Docker Compose configuration for Fluxora-Backend, orchestrating the HTTP service, Postgres for chain-derived data, and Redis for caching. It establishes predictable environment behavior and failure handling.

Changes

• Created docker-compose.yml with App, Postgres, and Redis services.
• Defined explicit trust boundaries for anonymous, partner, and admin roles.
• Implemented health checks and failure modes (e.g., handling DB/Stellar RPC outages).
• Added logging and observability notes to assist operators with incident diagnosis.

closes #31

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