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

scripts/inspect-maquette.ts

@@ -9,7 +9,9 @@ for (const file of ["FISE-INFO-2025.xlsx", "FISA-INFO-2025.xlsx"]) {
   for (const sheetName of wb.SheetNames) {
     console.log(`\n--- Sheet: ${sheetName} ---`);
     const sheet = wb.Sheets[sheetName];
-    const rows = XLSX.utils.sheet_to_json<(string | number | null)[]>(sheet, { header: 1 });
+    const rows = XLSX.utils.sheet_to_json<(string | number | null)[]>(sheet, {
+      header: 1,
+    });
     // Print first 5 cols of each row, mark rows that look like year/semester headers
     for (let i = 0; i < rows.length; i++) {
       const row = rows[i];
@@ -17,7 +19,9 @@ for (const file of ["FISE-INFO-2025.xlsx", "FISA-INFO-2025.xlsx"]) {
       const col0 = row[0] != null ? String(row[0]).trim() : "";
       // Show rows that are structural (year, semester, UE headers)
       if (col0 || (row[1] != null && String(row[1]).trim())) {
-        const preview = row.slice(0, 6).map(c => c != null ? String(c).substring(0, 25) : "").join(" | ");
+        const preview = row.slice(0, 6).map((c) =>
+          c != null ? String(c).substring(0, 25) : ""
+        ).join(" | ");
         console.log(`  [${i}] ${preview}`);
       }
     }