model : support Step3.5-Flash (#19283)

model : support Step3.5-Flash (#19283)

* Support Step3.5-Flash

* fix: norm.weight + 1 (HF zero_centered=true)

* step35: simplify GGUF conversion + drop redundant rope KVs

* Address review feedback

* rename limits -> clamp

* Apply suggestions from code review

Co-authored-by: Sigbjørn Skjæret <redacted>
* Apply suggestion from @CISC

Co-authored-by: Sigbjørn Skjæret <redacted>
* rename swiglu limits -> swiglu clamp in LLM_KV

* avoid CI fail

* Apply suggestions from code review

* Apply suggestions from code review

* disabled KV shifting for LLM_ARCH_STEP35

* Apply suggestions from code review

* mistakenly removed cmath

* add model size && apply missed suggestion

* assert partial_rotary_factors

* fix CI errors:

* load freq_base_swa

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Co-authored-by: lvyichen <redacted>
Co-authored-by: Sigbjørn Skjæret <redacted>