Implemented a secure signup flow #78
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Implemented secure signup flow with user-defined password encryption and email verification.
Key Changes
✅ Eliminated hardcoded "1234" across entire codebase
✅ User-defined password encryption for wallet private keys
✅ Email verification with OTP before wallet creation
✅ Production-ready cleanup - removed all test artifacts
New Features
Security Impact
BEFORE: All wallets encrypted with "1234" 🚨
AFTER: Each wallet encrypted with unique user password ✅
Closes #65