feat(node): skip node chat server when scheduler_addr is not specified

[sl-gn]

📝 Change Type

Please select the type of change this PR introduces (choose one or more):

• [✅] feat: New feature.
• fix: Bug fix.
• docs: Documentation only changes.
• refactor: A code change that neither fixes a bug nor adds a feature.
• perf: Performance improvement.
• test: Adding missing tests or correcting existing tests.
• chore: Maintenance tasks (e.g., updating dependencies).

💡 Description

skip node chat server when scheduler_addr is not specified

Key Changes

1. skip node chat server when scheduler_addr is not specified
2. fix a bug, which is a wrong key for find request in node http handler