Feature/contract deployment

[kosisochukwu1234]

Closes #767

Resolves issue: [FEATURE] Add contract deployment pipeline with environment promotion

Changes:

• Added .github/workflows/contract-deploy.yml pipeline.
• Testnet deploys automatically on merges to main.
• Staging deploys automatically on release pull requests.
• Mainnet requires explicit manual approval (workflow dispatch).
• Made scripts/deploy.sh network configurable.
• STELLAR_CONTRACT_ID is updated via Github Repository Variables post-deploy so that dependent frontend/backend services have access to it.

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