parse: cache node aliases as a small map with a working timestamp

The alias cache stored the full listnodes output as an array and hung its
`last` stamp on that array, which JSON.stringify drops, and the refresh
condition was inverted besides. Net effect: every lightning send page view
refetched all ~16k nodes and rewrote ~10MB to the db. Keep only the
id→alias map with a real timestamp and refresh it hourly.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

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