Build advanced input validation framework

[ISTIFANUS-N]

Task Description

Scope: Create a comprehensive validation layer for all contract inputs

Acceptance Criteria:

• Implement address validation (format, blacklist checks)
• Add numerical bounds checking with configurable limits
• Create string validation (length, allowed characters)
• Build reusable validation utilities for cross-chain data
• Add validation tests for all edge cases and attack vectors

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[LaGodxy]

@LaGodxy has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

Hello, I'm a fullStack developer with years of experience, I'll love to resolve this.

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Congratulations, @LaGodxy! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on January 31, 2026.

🧑‍💻 @LaGodxy: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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