fix(gallery/ltx-2.3): add diffusion_model flag to all variants (#9986)

LTX-2.3 entries (dev / distilled, UD-Q4_K_M / Q4_K_M / Q8_0) were
missing the `diffusion_model` option in their overrides. Without it,
gosd.cpp routes the main GGUF through the regular `model_path` code
path in sd.cpp, which doesn't apply the `model.diffusion_model.` tensor
prefix. sd.cpp's LTX-2.3 architecture detection (`VERSION_LTXAV`) in
get_sd_version checks for prefixed tensor names — without the prefix,
detection fails and load_model returns "could not load model".

This is the same bug we hit for Wan when the option was missing.
Adding `- diffusion_model` to all six LTX-2.3 entries' option blocks
makes load_model take the diffusion_model_path branch so detection
succeeds.

Assisted-by: Claude:claude-opus-4-7

Author: mudler

gallery/index.yaml

@@ -30844,6 +30844,7 @@
     parameters:
       model: ltx-2.3-22b-dev-UD-Q4_K_M.gguf
     options:
+      - diffusion_model
       - llm_path:gemma-3-12b-it-qat-UD-Q4_K_XL.gguf
       - vae_path:ltx-2.3-22b-dev_video_vae.safetensors
       - audio_vae_path:ltx-2.3-22b-dev_audio_vae.safetensors
@@ -30875,6 +30876,7 @@
     parameters:
       model: ltx-2.3-22b-dev-Q4_K_M.gguf
     options:
+      - diffusion_model
       - llm_path:gemma-3-12b-it-qat-UD-Q4_K_XL.gguf
       - vae_path:ltx-2.3-22b-dev_video_vae.safetensors
       - audio_vae_path:ltx-2.3-22b-dev_audio_vae.safetensors
@@ -30906,6 +30908,7 @@
     parameters:
       model: ltx-2.3-22b-dev-Q8_0.gguf
     options:
+      - diffusion_model
       - llm_path:gemma-3-12b-it-qat-UD-Q4_K_XL.gguf
       - vae_path:ltx-2.3-22b-dev_video_vae.safetensors
       - audio_vae_path:ltx-2.3-22b-dev_audio_vae.safetensors
@@ -30965,6 +30968,7 @@
     parameters:
       model: ltx-2.3-22b-distilled-UD-Q4_K_M.gguf
     options:
+      - diffusion_model
       - llm_path:gemma-3-12b-it-qat-UD-Q4_K_XL.gguf
       - vae_path:ltx-2.3-22b-distilled_video_vae.safetensors
       - audio_vae_path:ltx-2.3-22b-distilled_audio_vae.safetensors
@@ -30995,6 +30999,7 @@
     parameters:
       model: ltx-2.3-22b-distilled-Q4_K_M.gguf
     options:
+      - diffusion_model
       - llm_path:gemma-3-12b-it-qat-UD-Q4_K_XL.gguf
       - vae_path:ltx-2.3-22b-distilled_video_vae.safetensors
       - audio_vae_path:ltx-2.3-22b-distilled_audio_vae.safetensors
@@ -31025,6 +31030,7 @@
     parameters:
       model: ltx-2.3-22b-distilled-Q8_0.gguf
     options:
+      - diffusion_model
       - llm_path:gemma-3-12b-it-qat-UD-Q4_K_XL.gguf
       - vae_path:ltx-2.3-22b-distilled_video_vae.safetensors
       - audio_vae_path:ltx-2.3-22b-distilled_audio_vae.safetensors