Add interaction scripts and token utilities

[bhenzdev]

This update adds scripts and utility functions to interact with the Solantra Coin smart contract.

New features included:

• /scripts/deploy.js → Script to deploy the Solantra Coin contract on Solana
• /scripts/mint.js → Mint new tokens to a wallet
• /scripts/transfer.js → Transfer tokens between wallets
• /scripts/balance.js → Check token balance of any wallet
• /utils → Helper functions for easier blockchain interaction

Instructions:

1. Install Node.js and Solana CLI
2. Run npm install in the project root
3. Update config.js with your wallet key and RPC endpoint
4. Execute scripts with node scripts/<script_name>.js

Notes:

• Scripts are designed for testing on Solana devnet
• Mainnet deployment requires careful auditing
• Future updates will include staking and token reward functions