feat: align OpenRPC server with simplified client API

- Updated RegisterRunnerParams to only require name (queue = name)
- Added AddRunnerParams with RunnerConfig for add_runner method
- Updated RunnerManagementParams and StopRunnerParams with secrets
- Added add_runner method to OpenRPC trait and implementation
- Removed duplicate AddRunnerParams definition
- Updated client register_runner to send params as JSON object
- Added TODO comments for moving secrets to HTTP headers

clients/openrpc/src/lib.rs

@@ -259,12 +259,13 @@ impl SupervisorClient {
         secret: &str,
         name: &str,
     ) -> ClientResult<()> {
-        let _: () = self
+        let params = serde_json::json!({
+            "secret": secret,
+            "name": name
+        });
+        let _: String = self
             .client
-            .request(
-                "register_runner",
-                rpc_params![secret, name],
-            )
+            .request("register_runner", rpc_params![params])
             .await.map_err(|e| ClientError::JsonRpc(e))?;
         Ok(())
     }