Fix voting gate to use round status, make eval doc uploads toggleable

Voting check now uses round.status === ROUND_ACTIVE instead of requiring
windowOpenAt/windowCloseAt date range, fixing manual open/reopen scenarios.
Added requireDocumentUpload toggle (default off) to evaluation round config
so rounds reusing prior-round documents don't need file requirements.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/admin/rounds/config/evaluation-config.tsx

@@ -143,6 +143,18 @@ export function EvaluationConfig({ config, onChange }: EvaluationConfigProps) {
             />
           </div>
 
+          <div className="flex items-center justify-between">
+            <div>
+              <Label htmlFor="requireDocumentUpload">Require Document Upload</Label>
+              <p className="text-xs text-muted-foreground">Applicants must upload documents for this evaluation round (disable if documents were uploaded in a previous round)</p>
+            </div>
+            <Switch
+              id="requireDocumentUpload"
+              checked={(config.requireDocumentUpload as boolean) ?? false}
+              onCheckedChange={(v) => update('requireDocumentUpload', v)}
+            />
+          </div>
+
           <div className="flex items-center justify-between">
             <div>
               <Label htmlFor="peerReviewEnabled">Peer Review</Label>