Foro: mover tema entre foros (moderadores)

- lib/forum-write.ts: moveTopic (forum_id + moved=1). lib/forum.ts: listForumsForMove.
- API /api/forum/moderate: acción 'move' con forumId, validando foro destino visible
  y distinto del actual.
- TopicModBar: selector «Mover a» con los foros visibles (excl. el actual); tras mover,
  redirige al foro destino.
- i18n es/en: Forum.moveTopic.

Verificado: build OK, move 401 sin sesión, /forum 200.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-next/components/TopicModBar.tsx

@@ -8,16 +8,18 @@ export function TopicModBar({
   topicId,
   locked,
   sticky,
+  moveForums = [],
 }: {
   topicId: number
   locked: boolean
   sticky: boolean
+  moveForums?: { id: number; name: string }[]
 }) {
   const t = useTranslations('Forum')
   const router = useRouter()
   const [busy, setBusy] = useState(false)
 
-  async function act(action: string, confirmMsg?: string) {
+  async function act(action: string, extra?: Record<string, unknown>, confirmMsg?: string) {
     if (busy) return
     if (confirmMsg && !confirm(confirmMsg)) return
     setBusy(true)
@@ -26,11 +28,13 @@ export function TopicModBar({
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         credentials: 'same-origin',
-        body: JSON.stringify({ topicId, action }),
+        body: JSON.stringify({ topicId, action, ...extra }),
       })
       const data: { success?: boolean; forumId?: number } = await res.json()
       if (data.success && action === 'delete' && data.forumId) {
         router.push(`/forum/${data.forumId}`)
+      } else if (data.success && action === 'move') {
+        router.push(`/forum/${extra?.forumId}`)
       } else {
         router.refresh()
       }
@@ -58,9 +62,31 @@ export function TopicModBar({
       >
         {sticky ? t('unpin') : t('pin')}
       </button>
+      {moveForums.length > 0 && (
+        <select
+          defaultValue=""
+          disabled={busy}
+          onChange={(e) => {
+            const forumId = Number(e.target.value)
+            e.target.value = ''
+            if (forumId) act('move', { forumId })
+          }}
+          className="nw-input inline-block w-auto py-1 text-xs disabled:opacity-60"
+          aria-label={t('moveTopic')}
+        >
+          <option value="" disabled>
+            {t('moveTopic')}…
+          </option>
+          {moveForums.map((f) => (
+            <option key={f.id} value={f.id}>
+              {f.name}
+            </option>
+          ))}
+        </select>
+      )}
       <button
         type="button"
-        onClick={() => act('delete', t('confirmDeleteTopic'))}
+        onClick={() => act('delete', undefined, t('confirmDeleteTopic'))}
         disabled={busy}
         className="text-xs text-red-400 hover:text-red-300 disabled:opacity-60"
       >