Add admin overview of annotated pages with clear-orphaned actions

Adds admin.php (Admin -> Annotations): a wiki-wide table of annotated pages
with Normal/Orphaned counts, per-column filter, sortable

Add admin overview of annotated pages with clear-orphaned actions

Adds admin.php (Admin -> Annotations): a wiki-wide table of annotated pages
with Normal/Orphaned counts, per-column filter, sortable headers, numbered
pager (entries_per_page config), and per-page and wiki-wide clear-orphaned
POST actions guarded by checkSecurityToken and auth_isadmin.

Refactors the orphan rule into helper::quoteMissing() shared by
findOrphaned() and the new pageCounts(); adds getAnnotatedPages() /
searchAnnotations() / clearOrphanedAll() to the helper. Extends HelperTest
with four new coverage cases. All four locales (en, de, ru, ja) carry the
new admin strings.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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