refactor: extract Wan VAE implementation#1614
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- ggml_backend_is_cpu -> sd_backend_is_cpu (upstream leejet#1591 dynamic CPU backend), 7 call sites in ggml_extend.hpp + stable-diffusion.cpp. - re-declare int kv_pad in ggml_ext_attention_ext (upstream leejet#1453 dropped it; the fork keeps the opt-out pad path via flash_skip_kv_pad, capturing kv_pad by-ref). - nava example: ggml_backend_cpu_init -> sd_backend_cpu_init, and include model/vae/wan_vae.hpp (WanVAERunner extracted from wan.hpp upstream leejet#1614). Builds clean: sd-cli + sd-server + nava all green.
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wan.hppinto the newwan_vae.hppheader.Related Issue / Discussion
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