fix(gallery/ltx-2.3): add vae_decode_only:false for i2v / flf2v

LTX-2.3 i2v inference fails inside generate_video with:

  [ERROR] LTXAV image conditioning requires VAE encoder weights;
  create the context with vae_decode_only=false

Without vae_decode_only:false in the options block, gosd.cpp creates
the sd_ctx with VAE encoder weights freed, so latent encoding of the
init_image is impossible. Adding the option mirrors what we already
do for Wan i2v entries.

Affects all six LTX-2.3 entries (dev/distilled × UD-Q4_K_M, Q4_K_M,
Q8_0). T2V wasn't impacted by the missing option since it has no
init image to encode, which is why the T2V smoke earlier passed.

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

gallery/index.yaml

@@ -30844,6 +30844,8 @@
     parameters:
       model: ltx-2.3-22b-dev-UD-Q4_K_M.gguf
     options:
+      - diffusion_model
+      - "vae_decode_only:false"
       - 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 +30877,8 @@
     parameters:
       model: ltx-2.3-22b-dev-Q4_K_M.gguf
     options:
+      - diffusion_model
+      - "vae_decode_only:false"
       - 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 +30910,8 @@
     parameters:
       model: ltx-2.3-22b-dev-Q8_0.gguf
     options:
+      - diffusion_model
+      - "vae_decode_only:false"
       - 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 +30971,8 @@
     parameters:
       model: ltx-2.3-22b-distilled-UD-Q4_K_M.gguf
     options:
+      - diffusion_model
+      - "vae_decode_only:false"
       - 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 +31003,8 @@
     parameters:
       model: ltx-2.3-22b-distilled-Q4_K_M.gguf
     options:
+      - diffusion_model
+      - "vae_decode_only:false"
       - 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 +31035,8 @@
     parameters:
       model: ltx-2.3-22b-distilled-Q8_0.gguf
     options:
+      - diffusion_model
+      - "vae_decode_only:false"
       - 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