feat: add ntf-starter and nft-generator

[Wilbert957]

Is your feature request related to a problem? Please describe.

Currently, agents' data (character configuration and memory) are stored locally, making it difficult to share, transfer, or authorize agents between different users and systems. There's no standardized way to manage agent ownership and data sharing.

Describe the solution you'd like

Implement Agent NFT following ERC-7857 standard to:

1. Store agent data (character configuration and SQLite memory) on the 0G storage
2. Provide ownership management through NFTs
3. Enable agent data transfer, cloning, and authorization
4. Allow starting agents from existing NFTs with proper ownership validation

Key components:

1. AgentNFTClient for smart contract interaction
2. Generate NFT functionality with local agent data
3. NFT-based agent startup with data validation and retrieval

Describe alternatives you've considered

1. Traditional database storage with access control
2. Centralized cloud storage solutions
3. Custom token implementation without NFT standard
4. Local file sharing and manual authorization

Additional context

The implementation requires:

1. Integration with 0G blockchain
2. ERC-7857 smart contract deployment

Environment configuration:

1. ZEROG_RPC_URL
2. ZEROG_INDEXER_RPC_URL
3. ZEROG_PRIVATE_KEY
4. ZEROG_AGENT_NFT_CONTRACT_ADDRESS

For more details:

1. ERC-7857
2. 0G-Agent-NFT