feat(bookings): restrict management to assigned PIC or super admin

Secure API endpoints with requireBookingManager authorization check
Update confirmation page to prompt for login if unauthorized
Add safe redirect handling to login and guest middleware

app/middleware/guest.ts

@@ -1,6 +1,14 @@
 import { getDefaultAuthenticatedPath } from '~~/shared/auth'
 
-export default defineNuxtRouteMiddleware(async () => {
+function getSafeRedirectPath(value: unknown) {
+  const redirect = Array.isArray(value) ? value[0] : value
+
+  return typeof redirect === 'string' && redirect.startsWith('/') && !redirect.startsWith('//')
+    ? redirect
+    : null
+}
+
+export default defineNuxtRouteMiddleware(async (to) => {
   const auth = useAuth()
   await auth.fetchSession()
 
@@ -8,5 +16,5 @@ export default defineNuxtRouteMiddleware(async () => {
     return
   }
 
-  return navigateTo(getDefaultAuthenticatedPath(auth.user.value))
+  return navigateTo(getSafeRedirectPath(to.query.redirect) || getDefaultAuthenticatedPath(auth.user.value))
 })