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/page.tsx

@@ -112,11 +112,11 @@ async function DashboardStats({ editionId, sessionName }: DashboardStatsProps) {
       where: { programId: editionId },
     }),
     prisma.project.count({
-      where: { programId: editionId },
+      where: { round: { programId: editionId } },
     }),
     prisma.project.count({
       where: {
-        programId: editionId,
+        round: { programId: editionId },
         createdAt: { gte: sevenDaysAgo },
       },
     }),
@@ -149,7 +149,7 @@ async function DashboardStats({ editionId, sessionName }: DashboardStatsProps) {
       include: {
         _count: {
           select: {
-            roundProjects: true,
+            projects: true,
             assignments: true,
           },
         },
@@ -161,7 +161,7 @@ async function DashboardStats({ editionId, sessionName }: DashboardStatsProps) {
       },
     }),
     prisma.project.findMany({
-      where: { programId: editionId },
+      where: { round: { programId: editionId } },
       orderBy: { createdAt: 'desc' },
       take: 8,
       select: {
@@ -174,20 +174,18 @@ async function DashboardStats({ editionId, sessionName }: DashboardStatsProps) {
         logoKey: true,
         createdAt: true,
         submittedAt: true,
-        roundProjects: {
-          select: { status: true, round: { select: { name: true } } },
-          take: 1,
-        },
+        status: true,
+        round: { select: { name: true } },
       },
     }),
     prisma.project.groupBy({
       by: ['competitionCategory'],
-      where: { programId: editionId },
+      where: { round: { programId: editionId } },
       _count: true,
     }),
     prisma.project.groupBy({
       by: ['oceanIssue'],
-      where: { programId: editionId },
+      where: { round: { programId: editionId } },
       _count: true,
     }),
   ])
@@ -394,7 +392,7 @@ async function DashboardStats({ editionId, sessionName }: DashboardStatsProps) {
                               </Badge>
                             </div>
                             <p className="text-sm text-muted-foreground">
-                              {round._count.roundProjects} projects &middot; {round._count.assignments} assignments
+                              {round._count.projects} projects &middot; {round._count.assignments} assignments
                               {round.totalEvals > 0 && (
                                 <> &middot; {round.evalPercent}% evaluated</>
                               )}
@@ -461,10 +459,10 @@ async function DashboardStats({ editionId, sessionName }: DashboardStatsProps) {
                               {truncate(project.title, 45)}
                             </p>
                             <Badge
-                              variant={statusColors[project.roundProjects[0]?.status ?? 'SUBMITTED'] || 'secondary'}
+                              variant={statusColors[project.status ?? 'SUBMITTED'] || 'secondary'}
                               className="shrink-0 text-[10px] px-1.5 py-0"
                             >
-                              {(project.roundProjects[0]?.status ?? 'SUBMITTED').replace('_', ' ')}
+                              {(project.status ?? 'SUBMITTED').replace('_', ' ')}
                             </Badge>
                           </div>
                           <p className="text-xs text-muted-foreground mt-0.5">