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/assets/views.py

@@ -43,6 +43,15 @@ _KNOWN_CATS = [
 ]
 
 
+def _not_omni_create_q() -> Q:
+    """「不是全能创作产出」。不能只写 ~Q(metadata__feature="omni_create")。
+
+    metadata 里没有 feature 键时取值是 SQL NULL，NOT(NULL = 'x') 还是 NULL，整行会被筛掉 ——
+    历史资产（没写过 feature）会从「视频自由创作」「自由创作」「素材」这些分桶里整批消失。
+    """
+    return Q(metadata__feature__isnull=True) | ~Q(metadata__feature="omni_create")
+
+
 def _tab_q(tab: str) -> Q:
     if tab == "people":
         return Q(category="person")
@@ -57,13 +66,13 @@ def _tab_q(tab: str) -> Q:
     if tab == "image_creations":  # 图片自由创作
         return Q(category="free_create", asset_type="image")
     if tab == "video_creations":  # 视频自由创作
-        return Q(category="free_create", asset_type="video") & ~Q(metadata__feature="omni_create")
+        return Q(category="free_create", asset_type="video") & _not_omni_create_q()
     if tab == "creations":  # 自由创作(兼容旧入口:图片+视频)
-        return Q(category="free_create") & ~Q(metadata__feature="omni_create")
+        return Q(category="free_create") & _not_omni_create_q()
     if tab == "uploads":
         return Q(category="upload")
     if tab == "materials":  # 素材(期3):视频素材 = 所有视频,排除「最终成片」(final_video 隐藏不列)
-        return ~Q(category="final_video") & Q(asset_type="video") & ~Q(metadata__feature="omni_create")
+        return ~Q(category="final_video") & Q(asset_type="video") & _not_omni_create_q()
     if tab == "others":  # 其他(资产库成品化):我的上传 + 未归类非视频(兜底)
         return Q(category="upload") | (~Q(category__in=_KNOWN_CATS) & ~Q(asset_type="video"))
     if tab == "unclassified":  # 未归类且非视频(也不含最终成片)
@@ -482,6 +491,14 @@ class ModelLibraryViewSet(ModelViewSet):
         if self.request.query_params.get("q"):
             q = self.request.query_params["q"]
             qs = qs.filter(Q(name__icontains=q) | Q(description__icontains=q))
+        # 标签筛选: ?tag=男人 或 ?tag=男人&tag=警察(多标签 AND)
+        raw_tags = self.request.query_params.getlist("tag") or []
+        if not raw_tags:
+            joined = (self.request.query_params.get("tags") or "").strip()
+            if joined:
+                raw_tags = [t.strip() for t in joined.split(",") if t.strip()]
+        for tag in raw_tags:
+            qs = qs.filter(metadata__tags__contains=[tag])
         # 官方模板靠前,再按新→旧
         return qs.order_by("-is_official", "-created_at")
 
@@ -605,6 +622,18 @@ class ModelLibraryViewSet(ModelViewSet):
         model.save(update_fields=["purged_at", "updated_at"])
         return Response(status=status.HTTP_204_NO_CONTENT)
 
+    @action(detail=False, methods=["get"], url_path="tags")
+    def tags(self, request):
+        """当前可见模特里出现过的标签(供前端筛选条)· 只返回后台标记为显示的。"""
+        from .model_library_tags import public_tag_rows
+
+        tab = (request.query_params.get("tab") or "").strip() or None
+        if tab not in (None, "official", "mine"):
+            tab = None
+        team = self.get_team()
+        items = public_tag_rows(tab=tab, team_id=getattr(team, "id", None))
+        return Response({"results": items})
+
     @action(detail=False, methods=["post"], url_path="upload", parser_classes=[MultiPartParser, FormParser])
     def upload(self, request):
         """真人上传:一张人像图 → 建 model_portrait 资产 + Model(source=upload)。三视图/声线后续补。"""
@@ -640,13 +669,27 @@ class ModelLibraryViewSet(ModelViewSet):
                 size_bytes=stored.size_bytes,
                 is_primary=True,
             )
+            raw_tags = request.data.get("tags")
+            tags: list[str] = []
+            if isinstance(raw_tags, str) and raw_tags.strip():
+                import json
+                try:
+                    parsed = json.loads(raw_tags)
+                    if isinstance(parsed, list):
+                        tags = [str(t).strip() for t in parsed if str(t).strip()]
+                    else:
+                        tags = [t.strip() for t in raw_tags.split(",") if t.strip()]
+                except Exception:
+                    tags = [t.strip() for t in raw_tags.split(",") if t.strip()]
+            elif isinstance(raw_tags, list):
+                tags = [str(t).strip() for t in raw_tags if str(t).strip()]
             model = Model.objects.create(
                 team=team,
                 created_by=request.user,
                 name=name,
                 source=Model.Source.UPLOAD,
                 portrait_asset=portrait,
-                metadata={"source": "upload"},
+                metadata={"source": "upload", "tags": tags},
             )
         return Response(ModelLibrarySerializer(model).data, status=status.HTTP_201_CREATED)