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

docs/components/fieldt.mdx

@@ -0,0 +1,30 @@
+---
+title: "FieldT"
+---
+
+## Example Usage
+
+```python
+from openrouter.components import FieldT
+
+# Open enum: unrecognized values are captured as UnrecognizedStr
+value: FieldT = "model"
+```
+
+
+## Values
+
+This is an open enum. Unrecognized values will not fail type checks.
+
+- `"model"`
+- `"provider"`
+- `"session_id"`
+- `"user_id"`
+- `"api_key_name"`
+- `"finish_reason"`
+- `"input"`
+- `"output"`
+- `"total_cost"`
+- `"total_tokens"`
+- `"prompt_tokens"`
+- `"completion_tokens"`