fix: correct process start time in LXC

[ssongliu]

Refs #13472

[Copilot]

Pull request overview

Fixes incorrect process start times reported in LXC environments by introducing a resolver that falls back to computing create time from /proc/stat (btime) and /proc/<pid>/stat (starttime) when gopsutil yields an implausible (future) timestamp.

Changes:

• Added ProcessCreateTimeResolver to normalize process create-time computation using /proc when needed (LXC skew workaround).
• Updated process listing and PID-detail endpoints to use the new resolver instead of proc.CreateTime().
• Standardized process StartTime formatting in the websocket process list output to YYYY-MM-DD HH:MM:SS.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
agent/utils/websocket/process_data.go	Uses the new resolver for per-process StartTime in process listings and adjusts formatting.
agent/utils/psutil/process.go	Introduces a create-time resolver with /proc-based fallback logic for LXC skew cases.
agent/go.mod	Promotes go-sysconf to a direct dependency for clock tick discovery.
agent/app/service/process.go	Uses the resolver for PID-detail StartTime to match the corrected logic.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.