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/server/routers/application.ts

@@ -191,7 +191,7 @@ export const applicationRouter = router({
       // Check if email already submitted for this round
       const existingProject = await ctx.prisma.project.findFirst({
         where: {
-          roundProjects: { some: { roundId } },
+          roundId,
           submittedByEmail: data.contactEmail,
         },
       })
@@ -223,7 +223,7 @@ export const applicationRouter = router({
       // Create the project
       const project = await ctx.prisma.project.create({
         data: {
-          programId: round.programId,
+          roundId,
           title: data.projectName,
           teamName: data.teamName,
           description: data.description,
@@ -246,15 +246,6 @@ export const applicationRouter = router({
         },
       })
 
-      // Create RoundProject entry
-      await ctx.prisma.roundProject.create({
-        data: {
-          roundId,
-          projectId: project.id,
-          status: 'SUBMITTED',
-        },
-      })
-
       // Create team lead membership
       await ctx.prisma.teamMember.create({
         data: {
@@ -362,7 +353,7 @@ export const applicationRouter = router({
     .query(async ({ ctx, input }) => {
       const existing = await ctx.prisma.project.findFirst({
         where: {
-          roundProjects: { some: { roundId: input.roundId } },
+          roundId: input.roundId,
           submittedByEmail: input.email,
         },
       })