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/components/admin/advance-projects-dialog.tsx

@@ -240,7 +240,7 @@ export function AdvanceProjectsDialog({
                         </TableCell>
                         <TableCell>
                           <Badge variant="secondary" className="text-xs">
-                            {(project.roundProjects?.[0]?.status ?? 'SUBMITTED').replace('_', ' ')}
+                            {(project.status ?? 'SUBMITTED').replace('_', ' ')}
                           </Badge>
                         </TableCell>
                       </TableRow>

src/components/admin/remove-projects-dialog.tsx

@@ -187,7 +187,7 @@ export function RemoveProjectsDialog({
                           </TableCell>
                           <TableCell>
                             <Badge variant="secondary" className="text-xs">
-                              {(project.roundProjects?.[0]?.status ?? 'SUBMITTED').replace('_', ' ')}
+                              {(project.status ?? 'SUBMITTED').replace('_', ' ')}
                             </Badge>
                           </TableCell>
                         </TableRow>