fix: change $diagnostics to a property

Author: ymc9

packages/orm/src/client/client-impl.ts

@@ -440,11 +440,11 @@ export class ClientImpl {
         return this.$setOptions(newOptions);
     }
 
-    async $diagnostics(): Promise<Diagnostics> {
-        return {
+    get $diagnostics(): Promise<Diagnostics> {
+        return Promise.resolve({
             zodCache: this.inputValidator.zodFactory.cacheStats,
             slowQueries: this.slowQueries.map((q) => ({ ...q })).sort((a, b) => b.durationMs - a.durationMs),
-        };
+        });
     }
 
     $executeRaw(query: TemplateStringsArray, ...values: any[]) {

packages/orm/src/client/contract.ts

@@ -216,7 +216,7 @@ export type ClientContract<
     /**
      * Returns diagnostics information such as cache and slow query statistics.
      */
-    $diagnostics(): Promise<Diagnostics>;
+    get $diagnostics(): Promise<Diagnostics>;
 } & {
     [Key in GetSlicedModels<Schema, Options> as Uncapitalize<Key>]: ModelOperations<Schema, Key, Options, ExtQueryArgs>;
 } & ProcedureOperations<Schema, Options> &