PAI-DLC Job Diagnostics and Health Inspection

Read-only diagnostic analysis for PAI-DLC distributed training jobs, covering three scenarios:

• Queuing-stuck root cause analysis — quota check, node scheduling diagnosis, hyper-node availability
• Failed-job localization — failure classification, logs/events evidence chain, root cause identification
• Cluster health inspection — training throughput, hang detection, SanityCheck, restart stability

Architecture: PAI-DLC Job (read-only queries) + PAI Studio Resource Diagnosis API (queuing scenario).

0. Dependencies