Issue #2: User Profile & Registration System

[PeterOche]

Description

Implement the core user profile system that manages user registration, profile data, and basic account functionality on-chain.

Tasks

• Create User model with essential fields:
  • wallet_address (felt252)
  • username (felt252)
  • registration_timestamp (u64)
  • profile_metadata_hash (felt252)
  • is_active (bool)
• Implement user registration system
• Create user profile update functionality
• Add username uniqueness validation
• Implement profile deactivation/reactivation
• Create user lookup functions
• Add access control for profile modifications
• Implement events for user actions

Acceptance Criteria

• Users can register with unique wallet addresses
• Usernames are enforced to be unique
• Profile updates only allowed by profile owner
• Proper events are emitted for all user actions
• Gas optimization for common operations
• Comprehensive test coverage (>90%)

Dependencies

• Issue Issue #1: Dojo Project Initialization & Setup #1 (Dojo Project Setup)