fix: correct PRM resource in auth tests to match server URL

The tests used a PRM resource (https://api.example.com/mcp) that
didn't match the server URL (https://api.example.com/v1/mcp). This
was silently ignored before resource validation was added.

Author: pcarleton

tests/client/test_auth.py

@@ -963,7 +963,7 @@ async def test_auth_flow_with_no_tokens(self, oauth_provider: OAuthClientProvide
         # Send a successful discovery response with minimal protected resource metadata
         discovery_response = httpx.Response(
             200,
-            content=b'{"resource": "https://api.example.com/mcp", "authorization_servers": ["https://auth.example.com"]}',
+            content=b'{"resource": "https://api.example.com/v1/mcp", "authorization_servers": ["https://auth.example.com"]}',
             request=discovery_request,
         )
 
@@ -1116,7 +1116,7 @@ async def test_token_exchange_accepts_201_status(
         # Send a successful discovery response with minimal protected resource metadata
         discovery_response = httpx.Response(
             200,
-            content=b'{"resource": "https://api.example.com/mcp", "authorization_servers": ["https://auth.example.com"]}',
+            content=b'{"resource": "https://api.example.com/v1/mcp", "authorization_servers": ["https://auth.example.com"]}',
             request=discovery_request,
         )