fix: unify CSV import/export columns, fix import JS error, fix createThesis VALUES

- Fix createThesis SQL: extra ? placeholder in VALUES (27 values for 26 columns)
- Add createThesis integration tests to catch column/value mismatches
- Add CSV_COLUMNS as single source of truth in ExportController, deriving
  csvHeaders() and positional fallback from it
- Add missing columns to export query + CSV: duration_pages, duration_minutes,
  has_annexes, license_custom, contact_visible, objet
- Add missing columns to import INSERT: license_id, license_custom, cc2r,
  exemplaire_baiu, exemplaire_erg, objet, contact_visible, duration_pages,
  duration_minutes, has_annexes
- Resolve license name → license_id during import
- Fix XamxamInitFilePonds: add file-upload-filepond.js to admin-entry.js
  so FilePond initialization code is available on the admin list page
- Add FilePond vendor CSS to admin.min.css bundle (import dialog styling)
- Generate .admin-file-hint from csvHeaders() instead of hardcoded stale list
- Use positional fallback from CSV_COLUMNS for import cell parsing

app/src/Database.php

@@ -2266,7 +2266,7 @@ class Database
                 duration_pages, duration_minutes,
                 has_annexes,
                 submitted_at
-            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 0, "draft", ?, ?, ?, ?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP)
+            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 0, "draft", ?, ?, ?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP)
         ');
 
         $validObjet = ['tfe', 'thèse', 'frart'];
@@ -2696,7 +2696,13 @@ class Database
                 t.baiu_link,
                 t.exemplaire_baiu,
                 t.exemplaire_erg,
-                t.cc2r
+                t.cc2r,
+                t.license_custom,
+                t.contact_visible,
+                t.duration_pages,
+                t.duration_minutes,
+                t.has_annexes,
+                t.objet
             FROM theses t
             LEFT JOIN orientations    o  ON t.orientation_id  = o.id
             LEFT JOIN ap_programs     ap ON t.ap_program_id   = ap.id