SearchIndex: rector, phpcs, type hint fixes

SearchIndex: unify CollectionSearch API and optimize search pipeline

- Remove separate lookup() API from CollectionSearch. All searches now
use addTerm()/execute() with a single unified pipeline.

SearchIndex: unify CollectionSearch API and optimize search pipeline

- Remove separate lookup() API from CollectionSearch. All searches now
use addTerm()/execute() with a single unified pipeline.
- Add matches() predicate to Term using efficient string functions
(===, str_starts_with, str_ends_with, str_contains) instead of regex.
- Add caseInsensitive() support on CollectionSearch and Term for
metadata/title searches where indexed values preserve case.
- Remove callback support from MetadataSearch::lookupKey() — the only
real usage (case-insensitive substring) is replaced by
caseInsensitive() + wildcards.
- Remove min-length validation from Term. Add Tokenizer::isValidSearchTerm()
for callers that need it (FulltextSearch, Indexer::lookup).
- Optimize execute() from 4 group passes to 2: scan tokens + resolve
frequencies in one pass per group, batch entity name resolution, then
populate Terms.
- Store full match detail in Term: entity → token → frequency. New
accessors getMatches(), getEntityTokens(), getEntityFrequencies()
derive different views from this single data structure.
- Term no longer used as scratch pad by CollectionSearch. Index-internal
data (token IDs, entity IDs) stays local to execute(). Terms receive
only final resolved results.
- Use title from search results in MetadataSearch::pageLookupCallBack()
instead of re-fetching via p_get_first_heading().
- Update concept.txt documentation.

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SearchIndex: add backward compatibility wrappers

Add deprecated wrappers for idx_* and ft_* functions that were removed
when inc/indexer.php and inc/fulltext.php were replaced by the new
Search clas

SearchIndex: add backward compatibility wrappers

Add deprecated wrappers for idx_* and ft_* functions that were removed
when inc/indexer.php and inc/fulltext.php were replaced by the new
Search classes. These wrappers delegate to the new architecture and
ensure existing plugins continue to work.

Deprecated standalone functions: idx_get_indexer, idx_getIndex,
idx_lookup, idx_listIndexLengths, idx_indexLengths, ft_pageSearch,
ft_backlinks, ft_mediause, ft_pageLookup, ft_snippet, ft_pagesorter,
ft_snippet_re_preprocess, ft_queryParser.

Deprecated methods on Indexer: lookupKey, getPages, addMetaKeys,
renameMetaValue, getPID, lookup.

Also migrates remaining core callers (Ajax, FeedCreator, ApiCore) to
use the new classes directly and fixes a UTF-8 case folding bug in
MetadataSearch title lookups.

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SearchIndex: rewrite MetadataSearch to use Collection classes

Replace MetadataIndex usage in MetadataSearch with the new Collection/Index
architecture. This completes the read-path migration so data

SearchIndex: rewrite MetadataSearch to use Collection classes

Replace MetadataIndex usage in MetadataSearch with the new Collection/Index
architecture. This completes the read-path migration so data written by the
Collection-based Indexer is read back correctly using TupleOps tuple format.

Generalize FrequencyCollectionSearch into CollectionSearch that works with any
AbstractCollection type (Frequency, Lookup, Direct) and handles both
split-by-length and non-split index layouts transparently. DirectCollection
participates via resolveTokenFrequencies() which maps token RID = entity RID.

Key changes:
- AbstractCollection gains isSplitByLength(), resolveTokenFrequencies(),
getEntitiesWithData(), and groupToSuffix() with validation
- Index groups are now int (0 = non-split, positive = token length)
- CollectionSearch provides both addTerm()/execute() for fulltext and
lookup() for metadata-style search (exact/wildcard/callback)
- MetadataSearch delegates entirely to collection APIs
- Shared filterPages() replaces duplicated page filtering logic
- All callers updated from MetadataIndex to MetadataSearch
- Tests moved to Search namespace with full coverage for new APIs

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SearchIndex: rewrite FulltextSearch to use FrequencyCollectionSearch

Replace FulltextIndex->lookupWords() with FrequencyCollectionSearch which
correctly handles the compact tuple format written by t

SearchIndex: rewrite FulltextSearch to use FrequencyCollectionSearch

Replace FulltextIndex->lookupWords() with FrequencyCollectionSearch which
correctly handles the compact tuple format written by the new Indexer.

Introduce QueryEvaluator with typed stack entries (PageSet,
NamespacePredicate, NegatedEntry) for RPN query evaluation. NOT wraps
its operand instead of computing a universe complement, so AND with a
negated operand becomes efficient set subtraction. The full page index
is only loaded for standalone negative or namespace-only queries.

Move QueryParser and QueryEvaluator into the new Search\Query namespace
along with the stack entry types.

Simplify FulltextSearch to orchestration: parse query, look up words,
evaluate, filter, sort. Replace FT_SNIPPET_NUMBER constant with
maxSnippets property. Combine ACL/existence/time filtering into a
single pass.

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catch up #3115 Sort with collator

added missing 'notns' related code

change MetadataSearch and FulltextSearch to non-singleton

singleton is not effective to reduce multiple instantiations, especially for MetadataSearch which is frequently used in ajax call.

change Index objects to non-singleton

Indexer, FulltextIndex, MetadataIndex uses common directory to store *.idx files, but this does not mean they should be singleton objects to avoid lock confrict

change Index objects to non-singleton

Indexer, FulltextIndex, MetadataIndex uses common directory to store *.idx files, but this does not mean they should be singleton objects to avoid lock confrictions.

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change static methods into instance methods

move backlinks() and mediause() into MediaIndex class

define getPages() in AbstractIndex instead of PageIndex

getPages() is inherited to each subclass of AbstractIndex, but MetadataIndex::getPages() will override the inherited method.

move lookup() to PagewordIndex class, reduce term 'Indexer'

make similar MetadataIndex::lookupKey() and PagewordIndex::lookup()

resolve conflictions, CodeSniffer errors

allow public access to getIndex(), etc.

separate methods into metadata, Pageword, Page index classes

change class name to MetadataSearch