[CICD] Add MUSA S5000 CI workflow

[HermiaHuan]

Summary

• Add MUSA S5000 platform CI configuration.
• Add MUSA Dockerfile, check/setup scripts, and test platform config.
• Enable MUSA in platform discovery and CI workflow.
• Add MUSA-specific Qwen3/Qwen3.6 E2E and benchmark smoke cases.
• Make artifact upload steps non-blocking to avoid self-hosted runner network flakes failing CI.

Validation

• ruff check passed
• ruff format --check passed
• bash syntax check passed
• MUSA unit/e2e/benchmark dry-run passed

[CLAassistant]

All committers have signed the CLA.