feat(security): Automated TLS cert auto-renewal monitoring check in CI #1362

🎯 Problem Statement & Impact

Alert maintainers 30 days before SSL certificate expiration on domain endpoints.

Protects sensitive user data, automated API key scoping, and encrypted transport.

🏗️ Technical Architecture & Affected Components

• Primary Component: backend/src/security/ & auth guards
• Integration Points: Ensures full backward compatibility across Soroban contracts, client SDKs, and backend services.
• Resource Management: Optimized memory utilization, efficient state storage keys, and extend_ttl rent management where applicable.

💻 Code Changes & Implementation Steps

1. Refactor key modules in backend/src/security/ & auth guards to fulfill standard code structure guidelines.
2. Implement explicit validation, error boundaries, and defensive checks.
3. Export clean TypeScript bindings or standard Rust/JS interfaces.
4. Verify end-to-end compatibility across all environment tiers (local testnet & mainnet).

🧪 Test Strategy & Verification Criteria

• Unit tests cover all primary control branches and edge cases cleanly.
• Integration tests verify contract/API boundaries without memory or balance leaks.
• Automated CI check passes clean linting, formatting, and security audits.

📈 Contribution to Project & Team Growth

Directly enhances platform scalability, user conversion, developer experience, or financial safety across the ecosystem.