Find every usage of Executors.newFixedThreadPool and Executors.newCachedThreadPool in this project. Replace with Executors.newVirtualThreadPerTaskExecutor() where the tasks are I/O-bound. List any cases where platform threads should be kept (CPU-bound work, native frames on the stack, and on Java 21 to 23 also synchronized blocks that block, which pin the carrier thread until Java 24) and justify each decision.
