Replace per-call new_current_thread() runtimes with a single
TokioRuntimeResource(Arc<Runtime>) built once at startup using
new_multi_thread(worker_threads(2)). The Arc is cloned cheaply into
each AsyncComputeTaskPool closure, eliminating repeated OS thread
allocation on every sync pull/push, auth, avatar fetch, and analytics
flush. Using a multi-threaded runtime ensures concurrent block_on calls
from different worker threads are safe.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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