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/components/forms/csv-import-form.tsx

@@ -38,7 +38,8 @@ import {
 import { cn } from '@/lib/utils'
 
 interface CSVImportFormProps {
-  roundId: string
+  programId: string
+  roundId?: string
   roundName: string
   onSuccess?: () => void
 }
@@ -72,7 +73,7 @@ interface MappedProject {
   metadataJson?: Record<string, unknown>
 }
 
-export function CSVImportForm({ roundId, roundName, onSuccess }: CSVImportFormProps) {
+export function CSVImportForm({ programId, roundId, roundName, onSuccess }: CSVImportFormProps) {
   const router = useRouter()
   const [step, setStep] = useState<Step>('upload')
   const [file, setFile] = useState<File | null>(null)
@@ -224,6 +225,7 @@ export function CSVImportForm({ roundId, roundName, onSuccess }: CSVImportFormPr
 
     try {
       await importMutation.mutateAsync({
+        programId,
         roundId,
         projects: valid,
       })