docs & code : enhance README with comprehensive setup guide and troubleshooting with code changes

[Bvvvp009]

• Add HOST_DATA_DIR documentation and setup instructions
• Improve Docker Compose examples with deployment scenarios
• Add comprehensive troubleshooting section for common issues
• Include performance optimization guidance for different systems
• Enhance configuration documentation with clear examples
• Fix JWT authentication issues and unknown env var warnings
• Add environment variable validation in all entrypoint scripts
• Prevent OP_NODE_L2_ENGINE_AUTH_RAW from being passed to op-node binary

Fixes #536, #438

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[kaspro183]

“This was just a test PR, nothing malicious intended

[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Bvvvp009]

Requesting review from maintainers if irrelevant close the PR. @danyalprout