- ThesisCreateController: comma-split auteurice, sort alphabetically,
use setThesisAuthors() instead of hardcoded createThesis() author_id
- Database::createThesis(): removed author_id param and hardcoded insert
- Database::findDuplicateThesis(): accepts array of author names, matches
any shared author via IN + DISTINCT
- ThesisEditController::save(): sort authors alphabetically on save
- File folder naming: slug from all authors alphabetically sorted
- v_theses_full GROUP_CONCAT: ORDER BY a.name ASC for deterministic display
- Migration 012_author_view_order.sql: rebuilds view with alphabetical order
