Remove dynamic form builder and complete RoundProject→roundId migration

Major cleanup and schema migration:
- Remove unused dynamic form builder system (ApplicationForm, ApplicationFormField, etc.)
- Complete migration from RoundProject junction table to direct Project.roundId
- Add sortOrder and entryNotificationType fields to Round model
- Add country field to User model for mentor matching
- Enhance onboarding with profile photo and country selection steps
- Fix all TypeScript errors related to roundProjects references
- Remove unused libraries (@radix-ui/react-toast, embla-carousel-react, vaul)

Files removed:
- admin/forms/* pages and related components
- admin/onboarding/* pages
- applicationForm.ts and onboarding.ts routers
- Dynamic form builder Prisma models and enums

Schema changes:
- Removed ApplicationForm, ApplicationFormField, OnboardingStep, ApplicationFormSubmission, SubmissionFile models
- Removed FormFieldType and SpecialFieldType enums
- Added Round.sortOrder, Round.entryNotificationType
- Added User.country

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/(mentor)/mentor/page.tsx

@@ -149,22 +149,22 @@ export default function MentorDashboard() {
                       <div className="space-y-1">
                         <div className="flex items-center gap-2 text-sm text-muted-foreground">
                           <span>
-                            {project.program.year} Edition
+                            {project.round?.program?.year} Edition
                           </span>
-                          {project.roundProjects?.[0]?.round && (
+                          {project.round && (
                             <>
                               <span>•</span>
-                              <span>{project.roundProjects[0].round.name}</span>
+                              <span>{project.round.name}</span>
                             </>
                           )}
                         </div>
                         <CardTitle className="flex items-center gap-2">
                           {project.title}
-                          {project.roundProjects?.[0]?.status && (
+                          {project.status && (
                             <Badge
-                              variant={statusColors[project.roundProjects[0].status] || 'secondary'}
+                              variant={statusColors[project.status] || 'secondary'}
                             >
-                              {project.roundProjects[0].status.replace('_', ' ')}
+                              {project.status.replace('_', ' ')}
                             </Badge>
                           )}
                         </CardTitle>