feat: add ranking criteria textarea + auto-rank toggle to evaluation config UI

The backend reads rankingCriteria from configJson but there was no UI field
to set it. Adds a Textarea and autoRankEnabled switch to the AI Features card
in the evaluation round config.

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

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

@@ -4,6 +4,7 @@ import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/com
 import { Input } from '@/components/ui/input'
 import { Label } from '@/components/ui/label'
 import { Switch } from '@/components/ui/switch'
+import { Textarea } from '@/components/ui/textarea'
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
 
 type EvaluationConfigProps = {
@@ -219,6 +220,35 @@ export function EvaluationConfig({ config, onChange }: EvaluationConfigProps) {
               onCheckedChange={(v) => update('generateAiShortlist', v)}
             />
           </div>
+
+          <div className="pt-2 border-t space-y-4">
+            <div className="flex items-center justify-between">
+              <div>
+                <Label htmlFor="autoRankEnabled">AI Ranking</Label>
+                <p className="text-xs text-muted-foreground">Rank projects using AI when all evaluations are complete</p>
+              </div>
+              <Switch
+                id="autoRankEnabled"
+                checked={(config.autoRankEnabled as boolean) ?? false}
+                onCheckedChange={(v) => update('autoRankEnabled', v)}
+              />
+            </div>
+
+            <div className="space-y-2">
+              <Label htmlFor="rankingCriteria">Ranking Criteria</Label>
+              <p className="text-xs text-muted-foreground">
+                Natural-language criteria the AI uses to rank projects. E.g. &quot;Prioritize innovation and ocean impact. Weight jury scores 60%, feasibility 40%.&quot;
+              </p>
+              <Textarea
+                id="rankingCriteria"
+                rows={4}
+                placeholder="Describe how projects should be ranked..."
+                value={(config.rankingCriteria as string) ?? ''}
+                onChange={(e) => update('rankingCriteria', e.target.value)}
+                className="resize-y"
+              />
+            </div>
+          </div>
         </CardContent>
       </Card>