赵月辉 / fastgpt-migrated

* fix: guard embedding token limits

* perf: split

* feat: test

* fix: avoid header-only table chunks

* chore: hide vector model chunk limit label

* fix: harden embedding token limit handling

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Co-authored-by: Archer <545436317@qq.com>
Co-authored-by: Finley Ge <finleyge@fastgpt.io>