Summary

• Build system resource usage through a helper that validates CPU and network stats are present.
• Return an internal server error instead of indexing empty gopsutil result slices.
• Add coverage for missing CPU percent, CPU time, and network IO stats.

Why

The resource-usage admin endpoint indexed cp[0], c[0], and ioCounters[0] directly. If gopsutil returns an empty slice for any of those calls, the endpoint can panic instead of returning a handled error.

Testing

• git diff --check
• Not run: Go toolchain is not installed in this environment.