模特库标签分页与全能创作收口：藏长视频、选择器分页

角色库导入打标签并支持筛选；模特库与全能创作角色/商品选择改为每页 20 条分页。临时限制成片 ≤60 秒，过滤对话里的超长时长选项，并收拢本地全能创作与后台用户相关修复。

core/backend/apps/ai/mentions.py

@@ -337,6 +337,25 @@ def _character_triview_asset(team, portrait_id):
     )
 
 
+def _newest_asset(*assets):
+    """多张可用图里取最新一张。已删/空值直接跳过。"""
+    living = [
+        asset for asset in assets
+        if asset is not None and not getattr(asset, "is_deleted", False)
+    ]
+    if not living:
+        return None
+    return max(living, key=lambda asset: (asset.created_at, str(asset.id)))
+
+
+def _single_entity_asset(cover, *triviews):
+    """一个角色/商品只喂一张参考图:有三视图用最新三视图,没有才用封面/立绘。
+
+    封面和三视图衣服经常不一致;两张一起送,出片模型会当成多出来的角色或 SKU。
+    """
+    return _newest_asset(*triviews) or cover
+
+
 def _append_ref(resolved: ResolvedRefs, asset, type_: str, label: str) -> bool:
     entry = _asset_reference(asset, type_, label)
     if not entry:
@@ -386,12 +405,17 @@ def resolve_refs(team, refs: list[dict]) -> ResolvedRefs:
                 resolved.missing.append(ref)
                 continue
             resolved.facts.append(product_facts_text(product))
+            chosen = _single_entity_asset(
+                product.cover_asset,
+                _product_triview_asset(product),
+            )
+            if chosen is not None and _append_ref(resolved, chosen, "product", product.title):
+                continue
             entry = _product_reference(product)
             if entry:
                 resolved.references.append(entry)
-            triview = _product_triview_asset(product)
-            if triview is not None:
-                _append_ref(resolved, triview, "product", f"{product.title}三视图")
+            elif chosen is None:
+                resolved.missing.append(ref)
             continue
         if type_ == "model":
             model = Model.objects.filter(
@@ -413,13 +437,14 @@ def resolve_refs(team, refs: list[dict]) -> ResolvedRefs:
             person_lines.extend(meta_lines)
             if desc or meta_lines:
                 resolved.facts.append("\n".join(person_lines))
-            # 形象图和三视图都带上(有就带,没有不加、不报错)。三视图锁脸更稳。
-            added = False
-            if _append_ref(resolved, model.portrait_asset, "model", model.name):
-                added = True
-            if _append_ref(resolved, model.triview_asset, "model", f"{model.name}三视图"):
-                added = True
-            if not added:
+            # 一人一张图:有三视图只用最新三视图。形象图和三视图衣服经常不一致,
+            # 两张一起送会被当成多出来的角色。
+            chosen = _single_entity_asset(
+                model.portrait_asset,
+                model.triview_asset,
+                _character_triview_asset(team, getattr(model.portrait_asset, "id", None)),
+            )
+            if not _append_ref(resolved, chosen, "model", model.name):
                 resolved.missing.append(ref)
             continue
         asset = Asset.objects.filter(
@@ -435,15 +460,14 @@ def resolve_refs(team, refs: list[dict]) -> ResolvedRefs:
         person_lines.extend(meta_lines)
         if desc or meta_lines:
             resolved.facts.append("\n".join(person_lines))
-        added = _append_ref(resolved, asset, type_, asset.name)
-        # 角色/模特立绘若有配对三视图,一并带给出片;没有就跳过,不要当成引用失败。
-        if type_ in {"character", "model", "asset"}:
-            portrait_id = asset.id
-            # 用户 @ 的就是三视图本身时,不再反查。
-            if asset.category != Asset.Category.TRI_VIEW:
-                paired = _character_triview_asset(team, portrait_id)
-                if paired is not None:
-                    _append_ref(resolved, paired, type_, f"{asset.name}三视图")
+        if type_ in {"character", "model", "asset"} and asset.category != Asset.Category.TRI_VIEW:
+            chosen = _single_entity_asset(
+                asset,
+                _character_triview_asset(team, asset.id),
+            )
+        else:
+            chosen = asset
+        added = _append_ref(resolved, chosen, type_, asset.name)
         if not added:
             resolved.missing.append(ref)