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>

prisma/cleanup-dummy.ts

@@ -8,15 +8,15 @@ async function cleanup() {
   // Find and delete the dummy round
   const dummyRound = await prisma.round.findFirst({
     where: { slug: 'round-1-2026' },
-    include: { roundProjects: { include: { project: true } } }
+    include: { projects: true }
   })
 
   if (dummyRound) {
     console.log(`Found dummy round: ${dummyRound.name}`)
-    console.log(`Projects in round: ${dummyRound.roundProjects.length}`)
+    console.log(`Projects in round: ${dummyRound.projects.length}`)
 
     // Get project IDs to delete
-    const projectIds = dummyRound.roundProjects.map(rp => rp.projectId)
+    const projectIds = dummyRound.projects.map(p => p.id)
 
     // Delete team members for these projects
     if (projectIds.length > 0) {
@@ -25,12 +25,6 @@ async function cleanup() {
       })
       console.log(`Deleted ${teamDeleted.count} team members`)
 
-      // Delete round-project associations
-      await prisma.roundProject.deleteMany({
-        where: { roundId: dummyRound.id }
-      })
-      console.log(`Deleted round-project associations`)
-
       // Delete the projects
       const projDeleted = await prisma.project.deleteMany({
         where: { id: { in: projectIds } }