refactor form structure per new spec + fix

- split jury into interne/externe/ULB,
- remove president from student form,
- add language_autre,
- split duration into pages+minutes+annexes,
- move licence to degrés d'ouverture with CC2r,
- add license_custom,
- filter PACS from student AP list,
- editable généralités help block,
- Libre toggle per settings

Fix:
- missing comma after cc4r column in schema.sql
- remove duplicate form footer from partage template
- remove couverture from student files fieldset; add promoteur ULB conditional disable via JS on Approfondi
- promoteur ULB: remove 'si applicable', make required when visible

app/storage/schema.sql

@@ -183,6 +183,7 @@ CREATE TABLE IF NOT EXISTS theses (
     -- Access and licensing
     access_type_id INTEGER,
     license_id INTEGER,
+    license_custom TEXT, -- free-text licence (if not in predefined list)
 
     -- Jury information
     jury_points DECIMAL(4,2), -- Points out of 20 (backoffice only)
@@ -205,7 +206,7 @@ CREATE TABLE IF NOT EXISTS theses (
     exemplaire_erg BOOLEAN DEFAULT 0,  -- Physical copy at ERG
 
     -- CC4r acceptance (collected in student form)
-    cc4r BOOLEAN DEFAULT 0
+    cc4r BOOLEAN DEFAULT 0,
 
     -- Timestamps
     created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
@@ -527,6 +528,7 @@ SELECT
     at.name as access_type,
     lt.name as license_type,
     t.license_id,
+    t.license_custom,
     t.access_type_id,
     t.jury_points,
     t.submitted_at,