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/(admin)/admin/rounds/page.tsx

@@ -75,7 +75,7 @@ type RoundData = {
   votingStartAt: string | null
   votingEndAt: string | null
   _count?: {
-    roundProjects: number
+    projects: number
     assignments: number
   }
 }
@@ -238,7 +238,7 @@ function ProgramRounds({ program }: { program: any }) {
                           {round.name}
                         </span>
                         <Badge variant="outline" className="text-[10px] px-1.5 py-0">
-                          {round._count?.roundProjects || 0}
+                          {round._count?.projects || 0}
                         </Badge>
                       </div>
                       {index < rounds.length - 1 && (
@@ -425,7 +425,7 @@ function SortableRoundRow({
       {/* Projects */}
       <div className="flex items-center gap-1.5">
         <FileText className="h-4 w-4 text-muted-foreground" />
-        <span className="font-medium">{round._count?.roundProjects || 0}</span>
+        <span className="font-medium">{round._count?.projects || 0}</span>
       </div>
 
       {/* Assignments */}
@@ -509,7 +509,7 @@ function SortableRoundRow({
               <AlertDialogTitle>Delete Round</AlertDialogTitle>
               <AlertDialogDescription>
                 Are you sure you want to delete &quot;{round.name}&quot;? This will
-                remove {round._count?.roundProjects || 0} project assignments,{' '}
+                remove {round._count?.projects || 0} project assignments,{' '}
                 {round._count?.assignments || 0} reviewer assignments, and all evaluations
                 in this round. The projects themselves will remain in the program. This action cannot be undone.
               </AlertDialogDescription>