Lifts the slice variant from chroma_lora into network_lokr so the generic
LoKR loader can dispatch to either NetworkModuleLokrChunk (equal chunks)
or NetworkModuleLokrSliceChunk (unequal ranges) based on ChunkSpec shape.
chroma_lora keeps the same slice path through an updated import.
- detect f2 model type for LoRAs via metadata, architecture, and filename/folder
- preprocess bare BFL-format keys with diffusion_model prefix for Flux2LoraLoaderMixin
- handle LoKR format via native NetworkModuleLokr with on-the-fly kron(w1, w2)
- add NetworkModuleLokrChunk for fused QKV split into separate Q/K/V modules
- activate native modules loaded via diffusers path
- improve error message for Flux1/Flux2 architecture mismatch