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/(observer)/observer/page.tsx

@@ -48,7 +48,7 @@ async function ObserverDashboardContent() {
         program: { select: { name: true, year: true } },
         _count: {
           select: {
-            roundProjects: true,
+            projects: true,
             assignments: true,
           },
         },
@@ -176,7 +176,7 @@ async function ObserverDashboardContent() {
                     </p>
                   </div>
                   <div className="text-right text-sm">
-                    <p>{round._count.roundProjects} projects</p>
+                    <p>{round._count.projects} projects</p>
                     <p className="text-muted-foreground">
                       {round._count.assignments} assignments
                     </p>

src/app/(observer)/observer/reports/page.tsx

@@ -34,7 +34,7 @@ async function ReportsContent() {
       },
       _count: {
         select: {
-          roundProjects: true,
+          projects: true,
           assignments: true,
         },
       },
@@ -70,7 +70,7 @@ async function ReportsContent() {
   })
 
   // Calculate totals
-  const totalProjects = roundStats.reduce((acc, r) => acc + r._count.roundProjects, 0)
+  const totalProjects = roundStats.reduce((acc, r) => acc + r._count.projects, 0)
   const totalAssignments = roundStats.reduce(
     (acc, r) => acc + r.totalAssignments,
     0
@@ -176,7 +176,7 @@ async function ReportsContent() {
                     </div>
                   </TableCell>
                   <TableCell>{round.program.name}</TableCell>
-                  <TableCell>{round._count.roundProjects}</TableCell>
+                  <TableCell>{round._count.projects}</TableCell>
                   <TableCell>
                     <div className="min-w-[120px] space-y-1">
                       <div className="flex justify-between text-sm">
@@ -237,7 +237,7 @@ async function ReportsContent() {
                 </p>
               )}
               <div className="flex items-center justify-between text-sm">
-                <span>{round._count.roundProjects} projects</span>
+                <span>{round._count.projects} projects</span>
                 <span className="text-muted-foreground">
                   {round.completedEvaluations}/{round.totalAssignments} evaluations
                 </span>