Finish centralized Phast OAuth refactor

server.py

@@ -130,7 +130,6 @@ def create(value: str, name: str = "") -> dict[str, Any]:
         raise ValueError("already exists")
     # Provision auth before durable state so a failed OAuth mutation cannot leave
     # a half-created personal MCP behind.
-    ensure_oauth_callback(value)
     return write(
         value,
         {