Workflow links: before/after order, larger uniform thumbnails

Adds a **Workflows** section to the model card so the templates that work with these files can be opened or downloaded straight from the repo page.

- 6 templates from [Comfy-Org/workflow_templates](https://github.com/Comfy-Org/workflow_templates), all first-party (no community `templates_*` submissions) and all runnable with stock ComfyUI nodes.
- Only templates that load a **diffusion model / checkpoint** from this repo are listed; templates that only take the shared `vae` / `text_encoders` / `clip_vision` files from here are left out.
- Each row shows the template's preview thumbnail(s) at a uniform 200 px, laid out side by side under a fixed two-column grid so single- and dual-preview templates line up. Dual-preview templates show their before/after pair, labelled, in the order before → after.
- Ordered by template usage.

Replaces the previous short workflow list with the full set.

Nothing else in the README is changed.

README.md

@@ -86,7 +86,7 @@ Place the files in the following folders:
 <tr><td align="center" valign="middle" style="text-align:center;vertical-align:middle"><a href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_t2v.json">MiniMax H3: Text to Video</a></td><td align="center" valign="middle" style="text-align:center;vertical-align:middle"><a href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_t2v.json"><img src="https://raw.githubusercontent.com/Comfy-Org/workflow_templates/main/templates/video_minimax_h3_t2v-1.webp" width="200" height="200" alt="MiniMax H3: Text to Video"></a></td><td align="center" valign="middle" style="text-align:center;vertical-align:middle"></td></tr>
 <tr><td align="center" valign="middle" style="text-align:center;vertical-align:middle"><a href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_i2v_continuation.json">Image to Video </a></td><td align="center" valign="middle" style="text-align:center;vertical-align:middle"><a href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_i2v_continuation.json"><img src="https://raw.githubusercontent.com/Comfy-Org/workflow_templates/main/templates/video_minimax_h3_i2v_continuation-1.webp" width="200" height="200" alt="Image to Video "></a></td><td align="center" valign="middle" style="text-align:center;vertical-align:middle"></td></tr>
 <tr><td align="center" valign="middle" style="text-align:center;vertical-align:middle"><a href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_multiframe_reference.json">MiniMax H3: Multiframe Reference</a></td><td align="center" valign="middle" style="text-align:center;vertical-align:middle"><a href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_multiframe_reference.json"><img src="https://raw.githubusercontent.com/Comfy-Org/workflow_templates/main/templates/video_minimax_h3_multiframe_reference-1.webp" width="200" height="200" alt="MiniMax H3: Multiframe Reference"></a></td><td align="center" valign="middle" style="text-align:center;vertical-align:middle"></td></tr>
-<tr><td align="center" valign="middle" style="text-align:center;vertical-align:middle"><a href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_fun_controlnet_union.json">MiniMax H3 Fun ControlNet Union</a></td><td align="center" valign="middle" style="text-align:center;vertical-align:middle"><a href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_fun_controlnet_union.json"><img src="https://raw.githubusercontent.com/Comfy-Org/workflow_templates/main/templates/video_minimax_h3_fun_controlnet_union-2.webp" width="200" height="200" alt="MiniMax H3 Fun ControlNet Union"></a><br>Before</td><td align="center" valign="middle" style="text-align:center;vertical-align:middle"><a href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_fun_controlnet_union.json"><img src="https://raw.githubusercontent.com/Comfy-Org/workflow_templates/main/templates/video_minimax_h3_fun_controlnet_union-1.webp" width="200" height="200" alt="MiniMax H3 Fun ControlNet Union"></a><br>After</td></tr>
+<tr><td align="center" valign="middle" style="text-align:center;vertical-align:middle"><a href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_fun_controlnet_union.json">MiniMax H3 Fun ControlNet Union</a></td><td align="center" valign="middle" style="text-align:center;vertical-align:middle"><a href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_fun_controlnet_union.json"><img src="https://raw.githubusercontent.com/Comfy-Org/workflow_templates/main/templates/video_minimax_h3_fun_controlnet_union-2.webp" width="200" height="200" alt="MiniMax H3 Fun ControlNet Union"></a><div align="center">Before</div></td><td align="center" valign="middle" style="text-align:center;vertical-align:middle"><a href="https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_fun_controlnet_union.json"><img src="https://raw.githubusercontent.com/Comfy-Org/workflow_templates/main/templates/video_minimax_h3_fun_controlnet_union-1.webp" width="200" height="200" alt="MiniMax H3 Fun ControlNet Union"></a><div align="center">After</div></td></tr>
 </tbody>
 </table>