fix model leak issue

app/utils/model.ts

@@ -202,3 +202,27 @@ export function isModelAvailableInServer(
   const modelTable = collectModelTable(DEFAULT_MODELS, customModels);
   return modelTable[fullName]?.available === false;
 }
+
+/**
+ * Checks if a model is not available on any of the specified providers in the server.
+ * 
+ * @param {string} customModels - A string of custom models, comma-separated.
+ * @param {string} modelName - The name of the model to check.
+ * @param {string|string[]} providerNames - A string or array of provider names to check against.
+ * 
+ * @returns {boolean} True if the model is not available on any of the specified providers, false otherwise.
+ */
+export function isModelNotavailableInServer(
+  customModels: string,
+  modelName: string,
+  providerNames: string | string[],
+) {
+  const modelTable = collectModelTable(DEFAULT_MODELS, customModels);
+  const providerNamesArray = Array.isArray(providerNames) ? providerNames : [providerNames];
+  for (const providerName of providerNamesArray){
+    const fullName = `${modelName}@${providerName.toLowerCase()}`;
+    if (modelTable[fullName]?.available === true)
+      return false;
+  }
+  return true;
+}