Fix MediaWiki 1.45+ compatibility by updating categorylinks schema usage

[hexmode]

MediaWiki 1.45+ has migrated the categorylinks table schema, replacing
the cl_to column with a reference to the linktarget table. This commit
updates all queries to use the new schema.

Changes:

• Query.php: Updated all category-related queries to join linktarget
  table and use lt_title instead of cl_to. Affected functions:

  • Goal categories query
  • _addcategories()
  • _articlecategory()
  • _category() (both AND and OR operators)
  • _notcategory()
  • _ordermethod() (category case)
  • getSubcategories()

• CreateView.php: Updated dpl_clview VIEW definition to include
  linktarget table joins and expose lt_title, lt_namespace fields

• Parse.php: Updated processQueryResults() to use lt_title for
  goal='categories' queries

• Article.php: Updated category heading code to use lt_title from
  linktarget table instead of cl_to

All joins now include proper namespace checks (lt_namespace = NS_CATEGORY)
to ensure correct category matching.

Fixes #505

🤖 Generated with Claude Code

Co-Authored-By: Claude [email protected]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[Universal-Omega]

I very much appreciate this PR its extremely helpful, however DPL3 (the current main branch) is unmaintained and not tested enough. I plan to merge pre-release (DPL4) into main within a day or two. Any chance you could do it again then?