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-all-dummy.ts

@@ -10,18 +10,18 @@ async function cleanup() {
       id: true,
       name: true,
       slug: true,
-      roundProjects: { select: { id: true, projectId: true, project: { select: { id: true, title: true } } } },
-      _count: { select: { roundProjects: true } }
+      projects: { select: { id: true, title: true } },
+      _count: { select: { projects: true } }
     }
   })
 
   console.log(`Found ${rounds.length} rounds:`)
   for (const round of rounds) {
-    console.log(`- ${round.name} (slug: ${round.slug}): ${round._count.roundProjects} projects`)
+    console.log(`- ${round.name} (slug: ${round.slug}): ${round._count.projects} projects`)
   }
 
   // Find rounds with 9 or fewer projects (dummy data)
-  const dummyRounds = rounds.filter(r => r._count.roundProjects <= 9)
+  const dummyRounds = rounds.filter(r => r._count.projects <= 9)
 
   if (dummyRounds.length > 0) {
     console.log(`\nDeleting ${dummyRounds.length} dummy round(s)...`)
@@ -29,15 +29,9 @@ async function cleanup() {
     for (const round of dummyRounds) {
       console.log(`\nProcessing: ${round.name}`)
 
-      const projectIds = round.roundProjects.map(rp => rp.projectId)
+      const projectIds = round.projects.map(p => p.id)
 
       if (projectIds.length > 0) {
-        // Delete round-project associations first
-        const rpDeleted = await prisma.roundProject.deleteMany({
-          where: { roundId: round.id }
-        })
-        console.log(`  Deleted ${rpDeleted.count} round-project associations`)
-
         // Delete team members
         const teamDeleted = await prisma.teamMember.deleteMany({
           where: { projectId: { in: projectIds } }