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/app/[locale]/forum/topic/[topicId]/page.tsx

@@ -1,7 +1,7 @@
 import { notFound } from 'next/navigation'
 import { getTranslations, setRequestLocale } from 'next-intl/server'
 import { Link } from '@/i18n/navigation'
-import { getTopic, getPosts, countPosts } from '@/lib/forum'
+import { getTopic, getPosts, countPosts, listForumsForMove } from '@/lib/forum'
 import { getSession } from '@/lib/session'
 import { forumIsModerator, canEditPost } from '@/lib/forum-perm'
 import { ReplyForm } from '@/components/ReplyForm'
@@ -33,6 +33,7 @@ export default async function TopicPage({
   const posts = await getPosts(id, (page - 1) * PER_PAGE, PER_PAGE)
   const session = await getSession()
   const isMod = await forumIsModerator(session)
+  const moveForums = isMod ? (await listForumsForMove()).filter((f) => f.id !== topic!.forum_id) : []
   const canReply = Boolean(session.username) && (!topic!.locked || isMod)
 
   return (
@@ -48,7 +49,9 @@ export default async function TopicPage({
         {topic!.name}
       </h1>
 
-      {isMod && <TopicModBar topicId={id} locked={topic!.locked} sticky={topic!.sticky} />}
+      {isMod && (
+        <TopicModBar topicId={id} locked={topic!.locked} sticky={topic!.sticky} moveForums={moveForums} />
+      )}
 
       <div className="space-y-4">
         {posts.map((post) => (