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/live-voting.ts

@@ -15,9 +15,13 @@ export const liveVotingRouter = router({
           round: {
             include: {
               program: { select: { name: true, year: true } },
-              projects: {
+              roundProjects: {
                 where: { status: { in: ['FINALIST', 'SEMIFINALIST'] } },
-                select: { id: true, title: true, teamName: true },
+                include: {
+                  project: {
+                    select: { id: true, title: true, teamName: true },
+                  },
+                },
               },
             },
           },
@@ -34,9 +38,13 @@ export const liveVotingRouter = router({
             round: {
               include: {
                 program: { select: { name: true, year: true } },
-                projects: {
+                roundProjects: {
                   where: { status: { in: ['FINALIST', 'SEMIFINALIST'] } },
-                  select: { id: true, title: true, teamName: true },
+                  include: {
+                    project: {
+                      select: { id: true, title: true, teamName: true },
+                    },
+                  },
                 },
               },
             },