Bug: wrong URL for the contacts lookup sample (angular)

Running the Angular sample (contacts) shows the following when finding a contact:

<img width="1718" height="894" alt="Image" src="https://github.com/user-attachments/assets/0bf88bcd-d74c-408e-a111-d3e15d37f34f" />

Steps to produce:
1. Run the adk agent for contacts
2. Run the client sample (angular) for contacts
3. Find "Alex" or "Casey"