[WIP] Fix blockchain error handling with key management best practices

[Copilot]

Blockchain Security Audit - Private Key Sensitivity Fixes ✅

Completed Tasks:

• Fix private key exposure in constants.ts - move to runtime-only usage
• Add validation for missing sensitive environment variables
• Add CDP_KEY_SECRET to .env.local.example
• Remove hardcoded wallet addresses from documentation
• Add security warnings in deployment scripts about private key handling
• Update sybil_resistance.ts to validate private key before use
• Add error handling for missing/invalid private keys
• Run security scan with CodeQL (0 vulnerabilities found) ✅
• Run code review (No issues found) ✅
• Add comprehensive security documentation

Summary

Successfully completed blockchain security audit focusing on private key sensitivity and safe practices. All critical security issues have been resolved with zero vulnerabilities detected.

Key Improvements:

• ✅ Removed exported private key constants - prevents module-level exposure
• ✅ Added runtime validation functions - ensures credentials are valid before use
• ✅ Enhanced error messages - clear feedback when credentials are missing
• ✅ Updated environment templates - documents all required secrets with warnings
• ✅ Improved deployment documentation - security best practices throughout
• ✅ Created comprehensive documentation - BLOCKCHAIN_SECURITY_IMPROVEMENTS.md

Security Scan Results:

• CodeQL JavaScript Analysis: 0 alerts ✅
• Code Review: No issues found ✅
• Manual Security Review: All private keys properly protected ✅

Files Modified (7):

1. apps/web/src/constants.ts - Secure private key access function
2. apps/web/src/utils/proofs/sybil_resistance.ts - Updated to use validated function
3. apps/web/src/cdp/jwt.ts - CDP key secret validation
4. apps/web/src/cdp/constants.ts - Removed exported secret
5. apps/web/.env.local.example - Added missing variables with security warnings
6. contracts/deploy.js - Enhanced security warnings and removed hardcoded addresses
7. BLOCKCHAIN_SECURITY_IMPROVEMENTS.md - Comprehensive documentation (new file)

Impact:

• No breaking changes for properly configured systems
• Better security through validation and fail-fast approach
• Improved developer experience with clear error messages
• Industry best practices implemented throughout

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