feat(xiaomi-tokenplan): add Claude-native MiMo V2.5 Pro alias via dedicated executor

Add mimo-v2.5-pro-claude alias routing to the Xiaomi TokenPlan Anthropic-compatible
/anthropic/v1/messages endpoint. Logic lives in a dedicated XiaomiTokenplanExecutor
(config-driven via targetFormat) instead of the shared DefaultExecutor.

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/executors/xiaomi-tokenplan.js

@@ -0,0 +1,19 @@
+import { DefaultExecutor } from "./default.js";
+import { resolveXiaomiTokenplanBaseUrl } from "../config/providers.js";
+import { getModelTargetFormat } from "../config/providerModels.js";
+import { FORMATS } from "../translator/formats.js";
+
+export class XiaomiTokenplanExecutor extends DefaultExecutor {
+  constructor() {
+    super("xiaomi-tokenplan");
+  }
+
+  // Claude-native aliases route to the Anthropic-compatible messages endpoint
+  buildUrl(model, stream, urlIndex = 0, credentials = null) {
+    const baseUrl = resolveXiaomiTokenplanBaseUrl(credentials);
+    if (getModelTargetFormat(model, model) === FORMATS.CLAUDE) {
+      return `${baseUrl.replace(/\/v1\/?$/, "/anthropic/v1")}/messages`;
+    }
+    return `${baseUrl}/chat/completions`;
+  }
+}