fix: save roundId on admin file upload and group assignments by round

The admin upload flow accepted roundId but never wrote it to the
ProjectFile record, causing all admin-uploaded files to appear under
"General". Fixed the create call, the listByProject filter, and the
listByProjectForStage grouping to also use the direct roundId field.

Jury assignments on the project detail page are now grouped by round
with per-round completion counts instead of a flat list.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/server/routers/file.ts

@@ -206,6 +206,7 @@ export const fileRouter = router({
       const file = await ctx.prisma.projectFile.create({
         data: {
           projectId: input.projectId,
+          roundId: input.roundId ?? null,
           fileType: input.fileType,
           fileName: input.fileName,
           mimeType: input.mimeType,
@@ -341,7 +342,10 @@ export const fileRouter = router({
 
       const where: Record<string, unknown> = { projectId: input.projectId }
       if (input.roundId) {
-        where.requirement = { roundId: input.roundId }
+        where.OR = [
+          { requirement: { roundId: input.roundId } },
+          { roundId: input.roundId, requirementId: null },
+        ]
       }
 
       return ctx.prisma.projectFile.findMany({
@@ -429,7 +433,8 @@ export const fileRouter = router({
           projectId: input.projectId,
           OR: [
             { requirement: { roundId: { in: eligibleRoundIds } } },
-            { requirementId: null },
+            { roundId: { in: eligibleRoundIds }, requirementId: null },
+            { roundId: null, requirementId: null },
           ],
         },
         include: {
@@ -454,7 +459,8 @@ export const fileRouter = router({
         files: typeof files
       }> = []
 
-      const generalFiles = files.filter((f) => !f.requirementId)
+      // Files with no round association at all go to General
+      const generalFiles = files.filter((f) => !f.requirementId && !f.roundId)
       if (generalFiles.length > 0) {
         grouped.push({
           roundId: null,
@@ -465,7 +471,9 @@ export const fileRouter = router({
       }
 
       for (const round of eligibleRounds) {
-        const roundFiles = files.filter((f) => f.requirement?.roundId === round.id)
+        const roundFiles = files.filter(
+          (f) => f.requirement?.roundId === round.id || (!f.requirementId && f.roundId === round.id)
+        )
         if (roundFiles.length > 0) {
           grouped.push({
             roundId: round.id,