�� Rector and PHPCS fixes

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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Merge branch 'master' into searchIndex-finish

There were a lot of conflicts to resolve. Not all of them may have been
resolved correctly...

* master: (1094 commits)
Login accessibility improvemen

Merge branch 'master' into searchIndex-finish

There were a lot of conflicts to resolve. Not all of them may have been
resolved correctly...

* master: (1094 commits)
Login accessibility improvements
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Remove HTML from strings based on title and tagline
SECURITY: fix XSS vulnerability. fixes #4512
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Fix typos in usermanager English strings
Replace hardcoded message by localized string
set DOKU_INC in rector
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Rector to rename print to echo calls

codestyle adjustments: class declaration braces

Apply rector fixes to inc/Ui

import classes, replace dbglog, simplify, remove unused statements, and other warnings from IntelliJ

update phpdocs,
rename dokuwiki/Ui/Draft to PageDraft

replace deprecated ft_backlinks() in Ui

remove unnecessary printing DOKU_LF

fix typo

Ui\Backlinks class replaces html_backlinks()