Fix topology view behavior when backend endpoint is missing

[kaskol10]

Description

Add a compatibility fallback to /api/v1/nodes for older deployments and include detailed debug logging in topology request handling so route, fetch, truncation, and parse failures are easier to diagnose.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Test update

Related Issues

#65
Closes #

Changes Made

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed

Test Results

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Notes