RTL resolves peer aliases by calling listnodes once per peer. A prior fix
(1cec7b1) bounded this to 20 concurrent calls plus a cache for the channel
list, but the peers list and route lookup still used an unbounded Promise.all,
firing one request per peer at once. On nodes with many peers this overwhelms
clnrest and fails with 'Resource temporarily unavailable (os error 11)'
(EAGAIN), so aliases fall back to raw node IDs.
- peers.ts and network.ts getRoute now resolve aliases via
runWithConcurrencyLimit(tasks, 20, ...), matching the channel list.
- Harden runWithConcurrencyLimit to call done() immediately for an empty task
list; otherwise an empty peers/route set would never send a response.
- Give the alias cache a 6h TTL and a max size (evicting oldest) so aliases
refresh without an RTL restart and the cache can't grow unbounded.
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