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6ba3i 4f036a881d Fix: Infinity keyword round-trip, highlight fallback, and KB update guards (#12660)
### What problem does this PR solve?

Fixes Infinity-specific API regressions: preserves ```important_kwd```
round‑trip for ```[""]```, restores required highlight key in retrieval
responses, and enforces Infinity guards for unsupported
```parser_id=tag``` and pagerank in ```/v1/kb/update```. Also removes a
slow/buggy pandas row-wise apply that was throwing ```ValueError``` and
causing flakiness.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
2026-01-16 20:03:52 +08:00
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