Decouple projects from rounds with RoundProject join table

Projects now exist at the program level instead of being locked to a
single round. A new RoundProject join table enables many-to-many
relationships with per-round status tracking. Rounds have sortOrder
for configurable progression paths.

- Add RoundProject model, programId on Project, sortOrder on Round
- Migration preserves existing data (roundId -> RoundProject entries)
- Update all routers to query through RoundProject join
- Add assign/remove/advance/reorder round endpoints
- Add Assign, Advance, Remove Projects dialogs on round detail page
- Add round reorder controls (up/down arrows) on rounds list
- Show all rounds on project detail page

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/server/routers/export.ts

@@ -103,21 +103,26 @@ export const exportRouter = router({
   projectScores: adminProcedure
     .input(z.object({ roundId: z.string() }))
     .query(async ({ ctx, input }) => {
-      const projects = await ctx.prisma.project.findMany({
+      const roundProjectEntries = await ctx.prisma.roundProject.findMany({
         where: { roundId: input.roundId },
         include: {
-          assignments: {
+          project: {
             include: {
-              evaluation: {
-                where: { status: 'SUBMITTED' },
+              assignments: {
+                include: {
+                  evaluation: {
+                    where: { status: 'SUBMITTED' },
+                  },
+                },
               },
             },
           },
         },
-        orderBy: { title: 'asc' },
+        orderBy: { project: { title: 'asc' } },
       })
 
-      const data = projects.map((p) => {
+      const data = roundProjectEntries.map((rp) => {
+        const p = rp.project
         const evaluations = p.assignments
           .map((a) => a.evaluation)
           .filter((e) => e !== null)
@@ -133,7 +138,7 @@ export const exportRouter = router({
         return {
           title: p.title,
           teamName: p.teamName,
-          status: p.status,
+          status: rp.status,
           tags: p.tags.join(', '),
           totalEvaluations: evaluations.length,
           averageScore: