Modify embedding model ID comparison to remove vendor suffixes, ensuring
consistent model identification when working with multiple knowledge
bases. This change affects dialog creation, chat operations, and
document retrieval test functions.

### What problem does this PR solve?

resolve this bug: https://github.com/infiniflow/ragflow/issues/5166

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

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Co-authored-by: wenju.li <wenju.li@deepctr.cn>