[docs]: give Open-H3-Regenerate-2K a reachable cookbook page

The configurable recipe had no page, no backend-model mapping and no sidebar entry, so the directory treated it as
example-only and the deployment link redirected to a missing path. The recipe task now groups under video upscale.

docs-site/content/cookbook/minimax-h3/open-h3-regenerate-2k.mdx

@@ -0,0 +1,7 @@
+---
+title: Open-H3-Regenerate-2K
+description: Configure Open-H3-Regenerate-2K serving, which regenerates a 768P MiniMax-H3 draft at 2560x1440.
+mode: frame
+---
+
+<Cookbook modelId="open-h3-regenerate-2k" />

docs-site/lib/cookbook-pages.ts

@@ -133,6 +133,7 @@ const backendModels: Record<string, string> = {
   "FastVideo/FastVideo-Minimax-FastH3-Preview-v0.2": "fasth3-preview",
   "FastVideo/FastVideo-FastH3-4-step-Preview-v1-VSA-DataFree": "fasth3-4step",
   "FastVideo/FastH3-OmniRef-NVFP4-QAD": "fasth3-omniref",
+  "Efficient-Large-Model/Open-H3-Regenerate-2K": "open-h3-regenerate-2k",
   "FastVideo/FastWan2.1-T2V-1.3B-Diffusers": "fastwan21",
   "Wan-AI/Wan2.1-I2V-14B-480P-Diffusers": "wan21-i2v",
   "FastVideo/LTX2-Distilled-Diffusers": "ltx2-distilled",

docs-site/navigation.json

@@ -174,6 +174,10 @@
             "label": "FastH3 4-Step V1",
             "href": "/cookbook/minimax-h3/fasth3-4step"
           },
+          {
+            "label": "Open-H3-Regenerate-2K",
+            "href": "/cookbook/minimax-h3/open-h3-regenerate-2k"
+          },
           {
             "label": "Recipes and setup",
             "href": "/cookbook/minimax-h3"

docs/assets/cookbook-recipes.json

@@ -764,7 +764,7 @@
       "id": "open-h3-regenerate-2k",
       "family": "minimax_h3",
       "stage": "inference",
-      "task": "Video to 2K video",
+      "task": "Video super-resolution (2K regeneration)",
       "label": "Open-H3-Regenerate-2K",
       "summary": "Regenerate a 768P MiniMax-H3 draft at 2560x1440 with NVlabs' three-step refiner. The output is silent.",
       "model": "Efficient-Large-Model/Open-H3-Regenerate-2K",