SearchIndex: use FileIndex for title token index

PageTitleCollection accesses titles by RID (one line at a time), so
loading the entire index into memory is wasteful. Override getTokenIndex()
to ret

SearchIndex: use FileIndex for title token index

PageTitleCollection accesses titles by RID (one line at a time), so
loading the entire index into memory is wasteful. Override getTokenIndex()
to return a FileIndex, matching the line-by-line access pattern used on
master.

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SearchIndex: accept pre-instantiated entity and token indexes in collections

Allow passing AbstractIndex objects for the entity and token
parameters instead of string names. This enables sharing ind

SearchIndex: accept pre-instantiated entity and token indexes in collections

Allow passing AbstractIndex objects for the entity and token
parameters instead of string names. This enables sharing index
instances between collections for efficiency.

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SearchIndex: add DirectCollection for 1:1 entity-token mappings

Introduce DirectCollection as a third collection type alongside
FrequencyCollection and LookupCollection. Direct collections store
exa

SearchIndex: add DirectCollection for 1:1 entity-token mappings

Introduce DirectCollection as a third collection type alongside
FrequencyCollection and LookupCollection. Direct collections store
exactly one token per entity at the entity's position in the token
index (entity.RID === token.RID), with no frequency or reverse indexes.

AbstractCollection now accepts optional frequency/reverse index names
(default to '') and skips locking empty index names.

Adds PageTitleCollection as the first concrete direct collection
for the page -> title mapping.

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