fix: Add usage tracking to config method (#904)

Author: jsonbailey

packages/sdk/server-ai/__tests__/LDAIClientImpl.test.ts

@@ -65,6 +65,14 @@ it('returns config with interpolated messagess', async () => {
     enabled: true,
     toVercelAISDK: expect.any(Function),
   });
+
+  // Verify tracking was called
+  expect(mockLdClient.track).toHaveBeenCalledWith(
+    '$ld:ai:config:function:single',
+    testContext,
+    key,
+    1,
+  );
 });
 
 it('includes context in variables for messages interpolation', async () => {

packages/sdk/server-ai/src/LDAIClientImpl.ts

@@ -146,6 +146,8 @@ export class LDAIClientImpl implements LDAIClient {
     defaultValue: LDAIDefaults,
     variables?: Record<string, unknown>,
   ): Promise<LDAIConfig> {
+    this._ldClient.track('$ld:ai:config:function:single', context, key, 1);
+
     const {
       tracker,
       enabled,