Singly linked coins cache#164
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Spent FRESH entries do not need to be written to the parent cache, but erasing them immediately requires arbitrary linked-list deletion from the cache entry. Keep those entries as spent FRESH tombstones, count them, and compact them by scanning only the flagged-entry list when memory pressure is about to trigger a cache write.
Spent FRESH entries are now retained as tombstones until compaction, so normal spend paths no longer need arbitrary linked-list deletion. Drop the back pointer from `CCoinsCacheEntry` and update list cleanup to use the predecessor already known by cursor and compaction iteration. This reduces the cache entry size by one pointer while preserving direct iteration over flagged entries.
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