feat: stages module, mobility frontend, theme toggle, employeeOnly access control

- Add stages module with full CRUD API and admin overview island
- Add mobility overview island (Liste, Kanban, Detail CRUD views)
- Add contract PDF upload/download endpoints for mobilites
- Add light/dark theme toggle in header
- Add employeeOnly flag to hide entire modules from students (admin, students, stages)
- Add read-only GET endpoints for modules/ues/ue-modules in notes module
- Add [slug].tsx catch-all routes for direct URL navigation
- Replace old mobility table with mobilites + stages schema (migration 0004)
- Allow students to create mobilites and upload contracts
- Redirect authenticated users from / to /apps catalog

routes/(apps)/mobility/(_props)/props.ts

@@ -3,14 +3,14 @@ import { AppProperties } from "$root/defaults/interfaces.ts";
 const properties: AppProperties = {
   name: "PolyMobility",
   icon: "flight_takeoff",
-  hint: "Student mobility management",
+  hint: "Suivi des mobilités internationales",
   pages: {
-    index: "Homepage",
-    overview: "Mobility overview",
-    edit_mobility: "Mobility management",
-    consult_students_test: "Test consult students",
+    index: "Accueil",
+    overview: "Suivi des mobilités",
+    "my-mobility": "Ma mobilité",
   },
-  adminOnly: ["edit_mobility", "consult_students_test"],
+  adminOnly: ["overview"],
+  studentOnly: ["my-mobility"],
 };
 
 export default properties;