Foro: selector para fijar el personaje del autor

- Modal "Cambiar personaje" (diseño de la web) con filtro, avatar de raza,
  nombre en color de clase y subtítulo nivel/raza/clase.
- Barra "Publicas como: X · Cambiar personaje" sobre el formulario de respuesta
  (solo con sesión iniciada).
- Preferencia persistente en acore_web.forum_character (por cuenta), validada.
- resolvePosters usa el personaje fijado si existe; si no, el de más nivel.
- API /api/forum/character (GET lista + actual, POST fijar), gated por sesión.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web-next/lib/forum.ts

@@ -413,8 +413,21 @@ export async function resolvePosters(ids: number[]): Promise<Map<number, PosterI
       if (!byAcc.has(acc)) byAcc.set(acc, [])
       byAcc.get(acc)!.push(c)
     }
+    // Personaje fijado por el usuario (si lo hay y sigue siendo suyo); si no, el de más nivel.
+    const pickByAcc = new Map<number, number>()
+    try {
+      const [picks] = await db(DB.web).query<RowDataPacket[]>(
+        `SELECT account, guid FROM forum_character WHERE account IN (${placeholders})`,
+        unique,
+      )
+      for (const p of picks) pickByAcc.set(Number(p.account), Number(p.guid))
+    } catch {
+      /* sin tabla de preferencias */
+    }
     for (const [acc, list] of byAcc) {
-      const c = list.reduce((best, cur) => (Number(cur.level) > Number(best.level) ? cur : best), list[0])
+      const pg = pickByAcc.get(acc)
+      const picked = pg ? list.find((x) => Number(x.guid) === pg) : undefined
+      const c = picked || list.reduce((best, cur) => (Number(cur.level) > Number(best.level) ? cur : best), list[0])
       charByAccount.set(acc, {
         guid: Number(c.guid), name: String(c.name), race: Number(c.race),
         gender: Number(c.gender), class: Number(c.class), level: Number(c.level),
@@ -500,3 +513,68 @@ export async function resolvePosters(ids: number[]): Promise<Map<number, PosterI
   }
   return map
 }
+
+export interface ForumCharOption {
+  guid: number
+  name: string
+  race: number
+  gender: number
+  class: number
+  level: number
+}
+
+/** Personajes de la cuenta para el selector del foro. */
+export async function getAccountCharactersForForum(accountId: number): Promise<ForumCharOption[]> {
+  if (!accountId) return []
+  try {
+    const [rows] = await db(DB.characters).query<RowDataPacket[]>(
+      'SELECT guid, name, race, gender, class, level FROM characters WHERE account = ? ORDER BY level DESC, name ASC',
+      [accountId],
+    )
+    return rows.map((r) => ({
+      guid: Number(r.guid), name: String(r.name), race: Number(r.race),
+      gender: Number(r.gender), class: Number(r.class), level: Number(r.level),
+    }))
+  } catch {
+    return []
+  }
+}
+
+/** GUID del personaje fijado por la cuenta para el foro (validado), o null. */
+export async function getForumCharacterPick(accountId: number): Promise<number | null> {
+  if (!accountId) return null
+  try {
+    const [rows] = await db(DB.web).query<RowDataPacket[]>(
+      'SELECT guid FROM forum_character WHERE account = ?',
+      [accountId],
+    )
+    const guid = rows[0] ? Number(rows[0].guid) : 0
+    if (!guid) return null
+    const [ok] = await db(DB.characters).query<RowDataPacket[]>(
+      'SELECT 1 FROM characters WHERE guid = ? AND account = ? LIMIT 1',
+      [guid, accountId],
+    )
+    return ok.length ? guid : null
+  } catch {
+    return null
+  }
+}
+
+/** Fija el personaje del foro para la cuenta (valida que le pertenece). */
+export async function setForumCharacterPick(accountId: number, guid: number): Promise<boolean> {
+  if (!accountId || !guid) return false
+  try {
+    const [ok] = await db(DB.characters).query<RowDataPacket[]>(
+      'SELECT 1 FROM characters WHERE guid = ? AND account = ? LIMIT 1',
+      [guid, accountId],
+    )
+    if (!ok.length) return false
+    await db(DB.web).query(
+      'INSERT INTO forum_character (account, guid) VALUES (?, ?) ON DUPLICATE KEY UPDATE guid = VALUES(guid)',
+      [accountId, guid],
+    )
+    return true
+  } catch {
+    return false
+  }
+}