Fix timeouts

[fjgcosta]

Description

On large clusters (3k+ pods), evaluating workloads does not work. Code times out before completion.
Also nginx timeouts are hardcoded on configmap template.

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

Closes #

Changes Made

Backend

• Increase listWorkloads context timeout from 10s to 60s; add proper 504 response on deadline exceeded
• Parallelize namespace iteration in ListAllWorkloads using bounded goroutines (max 10 concurrent) — reduces latency from O(N × latency) to O(max single namespace latency)
• Replace N individual StatefulSet.Get() calls in calculateWorkloadsStorage with a single cluster-wide List() call

Helm chart

• Make nginx proxy_connect_timeout, proxy_send_timeout, and proxy_read_timeout configurable via values.yaml; default proxy_read_timeout raised from 60s to 120s to align with the backend context timeout

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