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

docs/operations/granularityname.mdx

@@ -0,0 +1,25 @@
+---
+title: "GranularityName"
+---
+
+Granularity identifier
+
+## Example Usage
+
+```python
+from openrouter.operations import GranularityName
+
+# Open enum: unrecognized values are captured as UnrecognizedStr
+value: GranularityName = "minute"
+```
+
+
+## Values
+
+This is an open enum. Unrecognized values will not fail type checks.
+
+- `"minute"`
+- `"hour"`
+- `"day"`
+- `"week"`
+- `"month"`