Foro: edición/borrado de posts, moderación de temas y búsqueda

Portado desde forum/db.py + forum/permissions.py de Django:
- lib/forum-perm.ts: forumIsModerator (gmlevel >= FORUM_MOD_GMLEVEL) y
  canEditPost (autor o moderador).
- Edición y borrado lógico de posts (autor o mod), respetando tema bloqueado,
  con validación de longitud mínima (plainLength).
- Moderación de temas (solo mod): bloquear/desbloquear, fijar/no fijar, borrar.
- Búsqueda de temas por título/contenido (searchTopics/countSearchTopics)
  con página /forum/search y buscador en el índice.
- API: PATCH/DELETE /api/forum/post, POST /api/forum/moderate (401/403 correctos).
- UI: PostActions, TopicModBar, ForumSearchBox; marca "editado" y "[Fijado]".
- i18n: 22 claves nuevas en es/en.

Verificado: build OK, /forum y /forum/search 200, APIs 401 sin sesión.

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

web-next/app/[locale]/forum/topic/[topicId]/page.tsx

@@ -3,7 +3,10 @@ import { getTranslations, setRequestLocale } from 'next-intl/server'
 import { Link } from '@/i18n/navigation'
 import { getTopic, getPosts } from '@/lib/forum'
 import { getSession } from '@/lib/session'
+import { forumIsModerator, canEditPost } from '@/lib/forum-perm'
 import { ReplyForm } from '@/components/ReplyForm'
+import { PostActions } from '@/components/PostActions'
+import { TopicModBar } from '@/components/TopicModBar'
 
 export const dynamic = 'force-dynamic'
 
@@ -21,7 +24,8 @@ export default async function TopicPage({
   if (!topic) notFound()
   const posts = await getPosts(id)
   const session = await getSession()
-  const canReply = Boolean(session.username) && !topic!.locked
+  const isMod = await forumIsModerator(session)
+  const canReply = Boolean(session.username) && (!topic!.locked || isMod)
 
   return (
     <main className="mx-auto max-w-4xl px-4 py-8">
@@ -30,24 +34,33 @@ export default async function TopicPage({
           ← {t('backToForum')}
         </Link>
       </p>
-      <h1 className="mb-6 text-2xl font-bold text-amber-500">
+      <h1 className="mb-4 text-2xl font-bold text-amber-500">
+        {topic!.sticky && <span className="mr-2 text-sm text-nw-gold-light">[{t('pinned')}]</span>}
         {topic!.locked && <span className="mr-2 text-sm text-red-400">[{t('locked')}]</span>}
         {topic!.name}
       </h1>
 
+      {isMod && <TopicModBar topicId={id} locked={topic!.locked} sticky={topic!.sticky} />}
+
       <div className="space-y-4">
         {posts.map((post) => (
           <article key={post.id} className="nw-card">
             <div className="mb-2 flex items-center justify-between border-b border-amber-900/40 pb-2 text-sm">
               <span className="font-semibold text-amber-400">{post.poster}</span>
               {post.time && (
-                <span className="text-amber-200/50">{new Date(post.time).toLocaleString(locale)}</span>
+                <span className="text-amber-200/50">
+                  {new Date(post.time).toLocaleString(locale)}
+                  {post.edited && <span className="ml-2 italic text-amber-200/40">· {t('editedMark')}</span>}
+                </span>
               )}
             </div>
             <div
               className="prose prose-invert max-w-none text-sm"
               dangerouslySetInnerHTML={{ __html: post.text }}
             />
+            {canEditPost(session, isMod, post.poster_id) && (
+              <PostActions postId={post.id} initialText={post.text} />
+            )}
           </article>
         ))}
       </div>