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/projects/page.tsx

@@ -94,20 +94,20 @@ export default function MentorProjectsPage() {
                     <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 && (
-                          <Badge variant={statusColors[project.roundProjects[0].status] || 'secondary'}>
-                            {project.roundProjects[0].status.replace('_', ' ')}
+                        {project.status && (
+                          <Badge variant={statusColors[project.status] || 'secondary'}>
+                            {project.status.replace('_', ' ')}
                           </Badge>
                         )}
                       </CardTitle>