Update package dependencies to vitest v4.0.16 and enhance role management in auth utilities with new role-checking functions in tests

tests/members-endpoints.spec.ts

@@ -8,7 +8,23 @@ vi.mock('../server/utils/auth.js', () => ({
   readMembers: vi.fn(),
   writeUsers: vi.fn(),
   readSessions: vi.fn(),
-  writeSessions: vi.fn()
+  writeSessions: vi.fn(),
+  migrateUserRoles: vi.fn((user) => {
+    if (!user) return user
+    if (Array.isArray(user.roles)) return user
+    if (user.role) {
+      user.roles = [user.role]
+      delete user.role
+    } else {
+      user.roles = ['mitglied']
+    }
+    return user
+  }),
+  hasAnyRole: vi.fn((user, ...roles) => {
+    if (!user) return false
+    const userRoles = Array.isArray(user.roles) ? user.roles : (user.role ? [user.role] : [])
+    return roles.some(r => userRoles.includes(r))
+  })
 }))
 
 vi.mock('../server/utils/members.js', () => ({