docs: Mintlify MDX docs + docs.json; bump Speakeasy to 1.787.0 (#382)

docs/components/inputreference.mdx

@@ -0,0 +1,27 @@
+---
+title: "InputReference"
+---
+
+A reference asset used to guide video generation. Image references are supported by all providers; audio and video references are only honored by providers that support them (currently BytePlus Seedance 2.0).
+
+
+## Supported Types
+
+### `components.ContentPartAudio`
+
+```python
+value: components.ContentPartAudio = /* values here */
+```
+
+### `components.ContentPartImage`
+
+```python
+value: components.ContentPartImage = /* values here */
+```
+
+### `components.ContentPartVideo`
+
+```python
+value: components.ContentPartVideo = /* values here */
+```
+