feat: add simple validation system for app project

[dangershony]

Summary

• Implements simple validation system with single ProjectValidator class
• Includes environment-aware validation (debug vs production modes)
• Provides debug data population helper
• Minimal code changes required for integration

Changes

• Added - simple validation result pattern
• Added - all validation logic in one class
• Added - debug data population
• Added - integration example

Validation Rules

• Production: Strict validation (0.001-100 BTC, 10-365 penalty days, etc.)
• Debug: Lenient validation (bypasses strict limits for testing)

Integration

Ready to integrate with app project ViewModels with minimal changes.