Add Support for Deploying Chaincode from Local Docker Images

The current galachain deploy command only supports deploying chaincode using published image tags (e.g., from DockerHub or a registry), as seen in [src/commands/deploy.ts](https://github.com/GalaChain/sdk/blob/main/chain-cli/src/commands/deploy.ts). This can be limiting for local development workflows where developers test chaincode iterations locally before publishing.

## Proposal: Enhance the deploy command to optionally accept a local Docker image reference (e.g., by image ID or local image name). This could be gated by a flag like --local.

## Suggested Changes:
Extend CLI args parsing to support a --local flag.

Update Docker interaction logic to use docker save or similar tools to handle local image deployment when --local is set.

Validate that the image exists locally before attempting deployment.

Update the README with usage examples for local image deployment.