Custom ownership implementation lacks secure ownership transfer mechanism

The contract implements a basic ownership mechanism:

address public owner;

modifier onlyOwner() {
    require(msg.sender == owner, "Only owner can call this function");
    _;
}

However, this implementation:

1. Lacks ability to transfer ownership (no transferOwnership function).
2. Has no two-step ownership transfer process.
3. Could lead to permanent loss of admin functions if the owner address is compromised.

This is particularly concerning given the protocol's roadmap includes transitioning to DAO governance, which will require a secure ownership transfer mechanism.

Replace the custom ownership implementation with OpenZeppelin's Ownable2Step.

Ample Protocol: Fixed.

Zealynx: Verified.