feat: implement deployment automation pipeline with test and docs

[Prz-droid]

Deployment Automation Pipeline

Implements reproducible deployment workflow with environment promotion (dev → staging → prod).

Changes

Core Modules:

• Environment configuration with validation
• Deployment validator with security checks
• Environment promoter with rollback support

CI/CD:

• GitHub Actions workflow with 6-stage pipeline
• Automatic deployment on branch push
• Security scanning and validation

Tests:

• 86 tests, 88%+ coverage
• 97-100% coverage for deployment modules

Docs:

• Deployment guide
• Security documentation with threat model
• Environment configuration examples
• Quick reference

Security

• Production requires Stellar mainnet
• Rejects wildcard/localhost CORS
• npm audit in pipeline
• Environment protection rules

Test Output

Test Suites: 5 passed, 5 total
Tests:       86 passed, 86 total
Coverage:    88.04% statements, 89.36% branches

close #95

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[Prz-droid]

Hello, kindly approve and merge my work

[Prz-droid]

Review my PR