DeepseekV4: fix rollback with multi-seq (#26756)
* DeepseekV4: fix rollback with multi-seq
* fix model loading
* make pending rollback single use
* only clear cache for seq_id for full load
* add assert for compress ratio
* make graph topology static
* pass true instead of flags in clear_compressed
* cont : clean-up + TODOs
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
