Update model card: latent-space table + LDM HF links, SDXL/Qwen-Image VAE, flux2 2kto4k _2606 ckpt, updated demo cmd

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Update 2kto4k description: 4096 px decoding; note both variants support multiple aspect ratios

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Update README.md

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Update README.md

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Fix download command to scope to checkpoints/ only

Add model card with checkpoint inventory and teaser