feat: update ModelExpress metadata API to SourceIdentity-based schema#21222

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AndyDai-nv wants to merge 7 commits intosgl-project:mainfrom

AndyDai-nv:andy/mx-metadata-support

Commits on Mar 23, 2026

Update ModelExpress metadata API to match new SourceIdentity-based schema
AndyDai-nv
committed
Use Optional defaults for LoadConfig modelexpress fields and add MX server health check
AndyDai-nv
committed
Replace polling loop with single list_sources call and fail-fast error
AndyDai-nv
committed

Commits on Mar 31, 2026

Move uuid import to module level per review feedback
AndyDai-nv
committed

Commits on Apr 1, 2026

fix weight info mismatch bug
AndyDai-nv
committed

Commits on Apr 6, 2026