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/assignment.ts

@@ -374,16 +374,12 @@ export const assignmentRouter = router({
           where: { roundId: input.roundId },
           _count: true,
         }),
-        ctx.prisma.roundProject.findMany({
+        ctx.prisma.project.findMany({
           where: { roundId: input.roundId },
-          include: {
-            project: {
-              select: {
-                id: true,
-                title: true,
-                _count: { select: { assignments: true } },
-              },
-            },
+          select: {
+            id: true,
+            title: true,
+            _count: { select: { assignments: true } },
           },
         }),
       ])
@@ -394,7 +390,7 @@ export const assignmentRouter = router({
       })
 
       const projectsWithFullCoverage = projectCoverage.filter(
-        (rp) => rp.project._count.assignments >= round.requiredReviews
+        (p) => p._count.assignments >= round.requiredReviews
       ).length
 
       return {
@@ -446,20 +442,15 @@ export const assignmentRouter = router({
       })
 
       // Get all projects that need more assignments
-      const roundProjectEntries = await ctx.prisma.roundProject.findMany({
+      const projects = await ctx.prisma.project.findMany({
         where: { roundId: input.roundId },
-        include: {
-          project: {
-            select: {
-              id: true,
-              title: true,
-              tags: true,
-              _count: { select: { assignments: true } },
-            },
-          },
+        select: {
+          id: true,
+          title: true,
+          tags: true,
+          _count: { select: { assignments: true } },
         },
       })
-      const projects = roundProjectEntries.map((rp) => rp.project)
 
       // Get existing assignments to avoid duplicates
       const existingAssignments = await ctx.prisma.assignment.findMany({
@@ -583,22 +574,17 @@ export const assignmentRouter = router({
       })
 
       // Get all projects in the round
-      const roundProjectEntries = await ctx.prisma.roundProject.findMany({
+      const projects = await ctx.prisma.project.findMany({
         where: { roundId: input.roundId },
-        include: {
-          project: {
-            select: {
-              id: true,
-              title: true,
-              description: true,
-              tags: true,
-              teamName: true,
-              _count: { select: { assignments: true } },
-            },
-          },
+        select: {
+          id: true,
+          title: true,
+          description: true,
+          tags: true,
+          teamName: true,
+          _count: { select: { assignments: true } },
         },
       })
-      const projects = roundProjectEntries.map((rp) => rp.project)
 
       // Get existing assignments
       const existingAssignments = await ctx.prisma.assignment.findMany({