feat(storyboard): 故事板改分镜制(单场独立重跑/历史)+ 视频过审闸 + 审核前端如实化

三块改动在 services/views/pipeline/App/api 等文件按行交织、且过审闸后端依赖故事板新
模型,无法拆成各自独立可编译的提交,故合并为一次:

· 故事板分镜制:新增 StoryboardShot/StoryboardShotVersion(对标 VideoSegment/Version)
  + 数据迁移(采用版每帧转一 shot+已采用版本)。每镜一个 shot,各自历史版本,可单场
  重跑、逐场切换/采用,新增「开始生成故事板/单场重跑/采用某版」端点。重跑非阻塞(后台
  静默轮询出图,不锁其它场按钮);历史「查看」与「采用」分离(切版本不丢在制重跑)。
  视频取分镜图/删分镜清理/过审闸全部改读 storyboard_shots。
· 视频生成前过审闸:点生成校验含真人脸的人物立绘/故事板分镜是否过审,未过审弹窗列出
  哪一镜/哪个,可一键送审,挡住不生成(collect_video_review_blockers + precheck 端点)。
· 审核前端如实化:不再 `|| "processing"` 伪造审核中;送审失败经 onNotify 如实提示;
  审核轮询扩到视频阶段,送审后能看着盾变绿。

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

core/backend/apps/projects/serializers.py

@@ -13,6 +13,8 @@ from .models import (
     ScriptSegment,
     ScriptVersion,
     StoryboardFrame,
+    StoryboardShot,
+    StoryboardShotVersion,
     StoryboardVersion,
     SubtitleTrack,
     Timeline,
@@ -130,6 +132,54 @@ class StoryboardVersionSerializer(serializers.ModelSerializer):
         read_only_fields = fields
 
 
+# ── 故事板分镜制(对标 VideoSegment/Version):每镜一个 shot,采用版缩略图 + 各自历史版本 ──
+class StoryboardShotSerializer(serializers.ModelSerializer):
+    adopted_asset = serializers.SerializerMethodField()
+    adopted_asset_url = serializers.SerializerMethodField()
+    # 分镜图含人脸,后端自动送火山人像审核;暴露采用版审核态让前端挂盾牌
+    review_status = serializers.SerializerMethodField()
+    review_error = serializers.SerializerMethodField()
+    versions = serializers.SerializerMethodField()
+
+    class Meta:
+        model = StoryboardShot
+        fields = ["id", "script_segment", "sort_order", "status", "error_message", "prompt",
+                  "adopted_version", "adopted_asset", "adopted_asset_url", "review_status", "review_error", "versions"]
+        read_only_fields = fields
+
+    def get_adopted_asset(self, obj):
+        v = obj.adopted_version
+        return str(v.asset_id) if v and v.asset_id else None
+
+    def get_adopted_asset_url(self, obj) -> str:
+        v = obj.adopted_version
+        return _asset_preview_url(v.asset) if v is not None else ""
+
+    def get_review_status(self, obj) -> str:
+        v = obj.adopted_version
+        return (getattr(v.asset, "review_status", "") or "") if (v and v.asset_id) else ""
+
+    def get_review_error(self, obj) -> str:
+        v = obj.adopted_version
+        return (getattr(v.asset, "review_error", "") or "") if (v and v.asset_id) else ""
+
+    def get_versions(self, obj):
+        versions = sorted(obj.versions.all(), key=lambda v: (v.created_at is None, v.created_at), reverse=True)
+        return [
+            {
+                "id": str(v.id),
+                "asset": str(v.asset_id) if v.asset_id else None,
+                "asset_url": _asset_preview_url(v.asset) if v.asset_id else "",
+                "prompt": v.prompt,
+                "is_adopted": v.is_adopted,
+                "review_status": (getattr(v.asset, "review_status", "") or "") if v.asset_id else "",
+                "review_error": (getattr(v.asset, "review_error", "") or "") if v.asset_id else "",
+                "created_at": v.created_at.isoformat() if v.created_at else "",
+            }
+            for v in versions
+        ]
+
+
 class VideoSegmentVersionSerializer(serializers.ModelSerializer):
     class Meta:
         model = VideoSegmentVersion
@@ -289,7 +339,8 @@ class ProjectSerializer(serializers.ModelSerializer):
     video_segments = VideoSegmentSerializer(many=True, read_only=True)
     script_versions = ScriptVersionSerializer(many=True, read_only=True)
     base_asset_groups = BaseAssetGroupSerializer(many=True, read_only=True)
-    storyboard_versions = StoryboardVersionSerializer(many=True, read_only=True)
+    storyboard_versions = StoryboardVersionSerializer(many=True, read_only=True)  # 过渡期保留(旧整版,新生成不再写)
+    storyboard_shots = StoryboardShotSerializer(many=True, read_only=True)
     timeline = TimelineSerializer(read_only=True)
 
     class Meta:
@@ -307,6 +358,7 @@ class ProjectSerializer(serializers.ModelSerializer):
             "script_versions",
             "base_asset_groups",
             "storyboard_versions",
+            "storyboard_shots",
             "video_segments",
             "timeline",
             "created_at",