fix(k8s): update resource requests and limits

[dmitsh]

No description provided.

[greptile-apps]

Greptile Summary

This PR increases the Kubernetes resource requests and limits for both the topograph main chart and the node-observer sub-chart, addressing previously under-provisioned defaults.

• CPU limit raised from 100m → 400m (4×) in both charts
• Memory limit raised from 128Mi → 512Mi (4×) in both charts
• CPU request raised from 100m → 250m in both charts
• Memory request raised from 128Mi → 256Mi in both charts
• The change transitions pods from Guaranteed QoS class (requests == limits) to Burstable QoS class (requests < limits), allowing bursting up to the defined limits under load while scheduling on the lower requests values — this is a common best practice for variable-load workloads.

Confidence Score: 5/5

• Safe to merge — only adjusts Helm chart resource defaults with no logic changes.
• This PR is safe to merge. It only modifies Helm values files to update resource requests and limits. The changes are limited to two files, the new values are internally consistent (requests < limits in both charts), follow Kubernetes best practices, and are symmetric across both the main chart and the sub-chart. No logic, templates, or application code is touched.
• No files require special attention.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    subgraph Before["Before (Guaranteed QoS)"]
        A1["topograph\nCPU req/limit: 100m\nMemory req/limit: 128Mi"]
        B1["node-observer\nCPU req/limit: 100m\nMemory req/limit: 128Mi"]
    end

    subgraph After["After (Burstable QoS)"]
        A2["topograph\nCPU req: 250m / limit: 400m\nMemory req: 256Mi / limit: 512Mi"]
        B2["node-observer\nCPU req: 250m / limit: 400m\nMemory req: 256Mi / limit: 512Mi"]
    end

    Before -->|"Resource update"| After

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_{Last reviewed commit: 2c5104f}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.52%. Comparing base (4fa83d6) to head (2c5104f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #231   +/-   ##
=======================================
  Coverage   66.52%   66.52%           
=======================================
  Files          82       82           
  Lines        4562     4562           
=======================================
  Hits         3035     3035           
  Misses       1411     1411           
  Partials      116      116           

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