feat: cascade deletes, student notes, import popups, module reorganization

- Cascade delete on all entities (student, module, UE, user, role, promotion)
- Fix Response body reuse bug (factory functions instead of constants)
- Student note viewing via CAS uid (strip non-digit prefix)
- Fix middleware page visibility for students in LOCAL mode
- Import result popup component (shared across all import pages)
- Fix student import to use numEtud from Excel
- Bulk student selection with promo change and delete
- Move UE/UE-Module API and pages from notes to admin module
- Move promotions page from students to admin module
- Multi-year maquette import with per-year promo selection
- Inline promo creation in maquette import
- Static Excel templates (students, notes, maquette)
- Fix XLSX export using blob download instead of writeFile
- Allow students to read modules list (GET /modules)

tests/e2e/ues_test.ts

@@ -7,8 +7,8 @@ import {
   makeJsonRequest,
 } from "../helpers/handler.ts";
 import { seedUes, truncateAll } from "../helpers/db_integration.ts";
-import { handler as uesHandler } from "$apps/notes/api/ues.ts";
-import { handler as ueHandler } from "$apps/notes/api/ues/[idUE].ts";
+import { handler as uesHandler } from "$apps/admin/api/ues.ts";
+import { handler as ueHandler } from "$apps/admin/api/ues/[idUE].ts";
 
 // --- GET /ues ---