feat: jury composition + banner image upload

- migration 004: thesis_supervisors.role + is_external; view adds jury_president/jury_promoteurs/jury_lecteurs
- migration 005: theses.banner_path; view exposes t.banner_path and t.license_id
- Database: getThesisJury(), setThesisJury(), setBannerPath()
- admin/add.php: jury fieldset (président/promoteur/lecteurs + externe checkboxes, JS add/remove rows); banner file input
- admin/edit.php: jury fieldset pre-populated from DB; banner preview + remove checkbox + upload; multipart form
- admin/actions/formulaire.php: parse jury fields → setThesisJury(); banner upload to banners/
- tfe.php: three conditional jury rows (président·e, promoteur·ice, lecteur·ices)
- schema.sql: updated thesis_supervisors, theses, v_theses_full, v_theses_public definitions
- admin.css: fieldset, jury-row, jury-entry, btn-remove styles

storage/migrations/005_add_banner.sql

@@ -0,0 +1,65 @@
+-- Migration 005: Add banner_path column to theses for home page card thumbnails
+
+ALTER TABLE theses ADD COLUMN banner_path TEXT;
+
+-- Recreate v_theses_full to include banner_path
+DROP VIEW IF EXISTS v_theses_full;
+
+CREATE VIEW v_theses_full AS
+SELECT
+    t.id,
+    t.identifier,
+    t.title,
+    t.subtitle,
+    t.year,
+    t.is_doctoral,
+    o.name as orientation,
+    ap.name as ap_program,
+    ft.name as finality_type,
+    t.synopsis,
+    t.context_note,
+    t.duration_minutes,
+    t.duration_pages,
+    t.file_size_info,
+    at.name as access_type,
+    lt.name as license_type,
+    t.license_id,
+    t.jury_points,
+    t.submitted_at,
+    t.defense_date,
+    t.published_at,
+    t.is_published,
+    t.baiu_link,
+    t.banner_path,
+    GROUP_CONCAT(DISTINCT a.name) as authors,
+    GROUP_CONCAT(DISTINCT s.name) as supervisors,
+    GROUP_CONCAT(DISTINCT CASE WHEN ts.role = 'president'  THEN s.name END) as jury_president,
+    GROUP_CONCAT(DISTINCT CASE WHEN ts.role = 'promoteur'  THEN s.name END) as jury_promoteurs,
+    GROUP_CONCAT(DISTINCT CASE WHEN ts.role = 'lecteur'    THEN s.name END) as jury_lecteurs,
+    GROUP_CONCAT(DISTINCT l.name) as languages,
+    GROUP_CONCAT(DISTINCT fmt.name) as formats,
+    GROUP_CONCAT(DISTINCT k.keyword) as keywords
+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
+LEFT JOIN finality_types ft ON t.finality_id = ft.id
+LEFT JOIN access_types at ON t.access_type_id = at.id
+LEFT JOIN license_types lt ON t.license_id = lt.id
+LEFT JOIN thesis_authors ta ON t.id = ta.thesis_id
+LEFT JOIN authors a ON ta.author_id = a.id
+LEFT JOIN thesis_supervisors ts ON t.id = ts.thesis_id
+LEFT JOIN supervisors s ON ts.supervisor_id = s.id
+LEFT JOIN thesis_languages tl ON t.id = tl.thesis_id
+LEFT JOIN languages l ON tl.language_id = l.id
+LEFT JOIN thesis_formats tf ON t.id = tf.thesis_id
+LEFT JOIN format_types fmt ON tf.format_id = fmt.id
+LEFT JOIN thesis_keywords tk ON t.id = tk.thesis_id
+LEFT JOIN keywords k ON tk.keyword_id = k.id
+GROUP BY t.id;
+
+-- Recreate public view
+DROP VIEW IF EXISTS v_theses_public;
+
+CREATE VIEW v_theses_public AS
+SELECT * FROM v_theses_full
+WHERE is_published = 1;