docs: document both Meshy 6 ids and its real response

The generated page covered only meshy/meshy-6-image-to-3d; meshy/v6/image-to-3d
is the same model under a second id and resolves just as well — both are now
listed on the page and in the spec's model enum.

The Response block and the spec's 200 schema described the generic
image-generations shape: a data[] array of .png URLs, credits_used 120000,
usd_spent 0.06. The model returns no data array at all — it returns the mesh
itself (model_glb plus glb/fbx/obj/usdz/stl exports, texture maps, thumbnail,
seed) and costs 1.04. Both replaced with what a live call returned, and the
response fields are now explained on the page.

Two things a caller cannot discover from the old page: the request is
synchronous and takes minutes (the documented run took 5m24s, so a default
client timeout aborts a generation you still pay for), and the example
image_url was https://example.com/input.jpg, which the API cannot download.
Added a timeout warning, real timeouts in both samples, a reachable image, and
a table of the mesh-tuning parameters.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: Lookov

docs/SUMMARY.md

@@ -764,8 +764,8 @@
 * [3D-Generating Models](api-references/3d-generating-models/README.md)
   * [Magic](api-references/3d-generating-models/magic/README.md)
     * [magic/image-to-3d](api-references/3d-generating-models/magic/image-to-3d.md)
-  * [meshy](api-references/3d-generating-models/meshy/README.md)
-    * [Meshy 6 Image To 3D](api-references/3d-generating-models/meshy/meshy-6-image-to-3d.md)
+  * [Meshy](api-references/3d-generating-models/meshy/README.md)
+    * [Meshy 6 Image to 3D](api-references/3d-generating-models/meshy/meshy-6-image-to-3d.md)
   * [Stability AI](api-references/3d-generating-models/Stability-AI/README.md)
     * [Triposr](api-references/3d-generating-models/Stability-AI/triposr.md)
   * [Tencent](api-references/3d-generating-models/tencent/README.md)

docs/api-references/3d-generating-models/meshy/README.md

@@ -1,2 +1 @@
-# meshy
-
+# Meshy