fix: align dashboard uptime with boot time

[ssongliu]

Refs #13386

[Copilot]

🟡 Not ready to approve

It removes an apparently unrelated nginx module test suite and the new uptime calculation needs a safer guard/fallback to avoid pathological values when BootTime is missing/invalid.

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Pull request overview

Adjusts the agent dashboard’s “running time/uptime” calculation to be derived from host boot time (instead of the cached host.Info().Uptime value), addressing incorrect runtime reporting in /api/v2/dashboard/current/all/all (refs #13386).

Changes:

• Compute DashboardCurrent.Uptime from shotTime.Unix() - hostInfo.BootTime and reuse a single snapshot timestamp (shotTime) for the response.
• Update RunningTime to be computed from the newly derived Uptime.
• Remove agent/app/service/nginx_module_test.go (appears unrelated to the dashboard uptime fix).

File summaries

File	Description
agent/app/service/dashboard.go	Recomputes dashboard uptime from boot time and aligns snapshot timestamp usage.
agent/app/service/nginx_module_test.go	Deletes the nginx module test suite file (unrelated to uptime fix).

Review details

Comments suppressed due to low confidence (1)

agent/app/service/nginx_module_test.go:1

• The PR description/issue reference is about dashboard uptime, but this change deletes the entire nginx module test suite file. No equivalent tests appear elsewhere in the agent (e.g., the removed test names are not found), so this looks like an accidental deletion and also reduces coverage for nginx module behavior.

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Low

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[Copilot]

🟡 Not ready to approve

It includes an unrelated deletion of the nginx module test suite without a visible replacement or rationale, which is a blocking scope/coverage regression for this fix PR.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

This review doesn't count toward merge requirements. Sign up for the private preview to control whether Copilot approvals count.

Review details

Comments suppressed due to low confidence (1)

agent/app/service/dashboard.go:189

• This PR removes agent/app/service/nginx_module_test.go (appears to be the only Go test file under agent/app/**), which is unrelated to the dashboard uptime fix and reduces coverage for nginx_module.go without a replacement. Please either restore/move those tests in this PR, or split the deletion into a separate PR with rationale.

	shotTime := time.Now()
	hostInfo, err := psutil.HOST.GetHostInfo(false)
	if err != nil {

• Files reviewed: 2/2 changed files
• Comments generated: 0 new
• Review effort level: Low

We're testing this review assessment. Please use 👍 or 👎 to tell us if it's correct.