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/application.ts

@@ -186,7 +186,7 @@ export const applicationRouter = router({
       // Check if email already submitted for this round
       const existingProject = await ctx.prisma.project.findFirst({
         where: {
-          roundId,
+          roundProjects: { some: { roundId } },
           submittedByEmail: data.contactEmail,
         },
       })
@@ -218,11 +218,10 @@ export const applicationRouter = router({
       // Create the project
       const project = await ctx.prisma.project.create({
         data: {
-          roundId,
+          programId: round.programId,
           title: data.projectName,
           teamName: data.teamName,
           description: data.description,
-          status: 'SUBMITTED',
           competitionCategory: data.competitionCategory,
           oceanIssue: data.oceanIssue,
           country: data.country,
@@ -242,6 +241,15 @@ 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: {
@@ -320,7 +328,7 @@ export const applicationRouter = router({
     .query(async ({ ctx, input }) => {
       const existing = await ctx.prisma.project.findFirst({
         where: {
-          roundId: input.roundId,
+          roundProjects: { some: { roundId: input.roundId } },
           submittedByEmail: input.email,
         },
       })