feat: switch from mcp_core::Role to rmcp::model::Role (#3488)

ui/desktop/openapi.json

@@ -1998,6 +1998,7 @@
       },
       "Role": {
         "type": "string",
+        "description": "A wrapper around rmcp::model::Role that implements ToSchema for utoipa",
         "enum": [
           "user",
           "assistant"

ui/desktop/src/api/types.gen.ts

@@ -338,6 +338,9 @@ export type ResourceContents = {
     uri: string;
 };
 
+/**
+ * A wrapper around rmcp::model::Role that implements ToSchema for utoipa
+ */
 export type Role = 'user' | 'assistant';
 
 export type RunNowResponse = {