Refactor configuration management to use environment-specific configs

[Smartdevs17]

Context

Configuration needs environment-specific overrides.

Current Limitation

Configuration is flat with no environment differentiation.

Expected Outcome

• Environment-specific configs
• Config validation with Zod
• Secret management integration
• Config drift detection

Acceptance Criteria

• Config files per environment
• Zod schema validation
• Secret management (AWS Secrets Manager)
• Config drift detection
• Config documentation
• Runtime config refresh
• Config comparison between environments

Technical Scope

• src/config/env.ts - Environment config
• backend/services/shared/ - Config service
• contracts/ - Contract config
• docs/ - Config documentation

[Oluwasuyi-Oluwatimilehin-Daniel]

@Oluwasuyi-Oluwatimilehin-Daniel has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello Maintainer, reviewed the issue in detail. Full stack background with solid experience relevant to this task. No blockers on my end — I'm ready to submit a PR shortly. Please assign.

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[bitcoindev817-hue]

@bitcoindev817-hue has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I'm a full-stack developer and I'd like to take this issue.
I understand the requirements and will follow the existing project structure, keep the implementation clean, and include proper tests where applicable.

ETA: 1–3 days (depending on scope)

ℹ️ Repo Maintainers: To accept this application, review their application or assign @bitcoindev817-hue to this issue.

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