fix(test): 集成测试StubAssetRepository增加status参数+素材默认ready

- StubAssetRepository的find/count方法增加status可选参数
- 列表测试创建的素材改为status=ready，匹配默认过滤规则
- 补充按created_at倒序排序，与真实实现行为一致

tests/integration/test_assets_api.py

@@ -103,19 +103,35 @@ class StubAssetRepository:
     def find_by_id(self, asset_id: str) -> Asset | None:
         return self._assets.get(asset_id)
 
-    def find_by_library(self, library_id: str, skip: int = 0, limit: int = 100) -> list[Asset]:
+    def find_by_library(
+        self, library_id: str, skip: int = 0, limit: int = 100, status: list[str] | None = None
+    ) -> list[Asset]:
         items = [a for a in self._assets.values() if a.library_id == library_id]
+        if status:
+            items = [a for a in items if a.status.value in status]
+        items.sort(key=lambda a: a.created_at, reverse=True)
         return items[skip : skip + limit]
 
-    def find_by_library_and_file_type(self, library_id: str, file_type: str) -> list[Asset]:
-        return [
+    def find_by_library_and_file_type(
+        self, library_id: str, file_type: str, skip: int = 0, limit: int = 100, status: list[str] | None = None
+    ) -> list[Asset]:
+        items = [
             a
             for a in self._assets.values()
             if a.library_id == library_id and a.mime_type and a.mime_type.startswith(file_type)
         ]
+        if status:
+            items = [a for a in items if a.status.value in status]
+        items.sort(key=lambda a: a.created_at, reverse=True)
+        return items[skip : skip + limit]
 
-    def find_by_project(self, project_id: str, skip: int = 0, limit: int = 100) -> list[Asset]:
+    def find_by_project(
+        self, project_id: str, skip: int = 0, limit: int = 100, status: list[str] | None = None
+    ) -> list[Asset]:
         items = [a for a in self._assets.values() if a.project_id == project_id]
+        if status:
+            items = [a for a in items if a.status.value in status]
+        items.sort(key=lambda a: a.created_at, reverse=True)
         return items[skip : skip + limit]
 
     def update(self, asset: Asset) -> Asset:
@@ -184,11 +200,17 @@ class StubAssetRepository:
                 count += 1
         return count
 
-    def count_by_project(self, project_id: str) -> int:
-        return len([a for a in self._assets.values() if a.project_id == project_id])
+    def count_by_project(self, project_id: str, status: list[str] | None = None) -> int:
+        items = [a for a in self._assets.values() if a.project_id == project_id]
+        if status:
+            items = [a for a in items if a.status.value in status]
+        return len(items)
 
-    def count_by_project_ids(self, project_ids: list[str]) -> int:
-        return len([a for a in self._assets.values() if a.project_id in project_ids])
+    def count_by_project_ids(self, project_ids: list[str], status: list[str] | None = None) -> int:
+        items = [a for a in self._assets.values() if a.project_id in project_ids]
+        if status:
+            items = [a for a in items if a.status.value in status]
+        return len(items)
 
     def find_by_library_and_file_hash(self, library_id: str, file_hash: str) -> Asset | None:
         if not file_hash:
@@ -395,7 +417,7 @@ class TestListAssets:
     """获取素材列表端点测试。"""
 
     def _create_test_assets(self, client, count: int = 3):
-        """辅助方法：创建测试素材。"""
+        """辅助方法：创建测试素材（status=ready）。"""
         for i in range(count):
             client.post(
                 "/api/v1/assets",
@@ -406,6 +428,7 @@ class TestListAssets:
                     "storage_key": f"uploads/video-{i}.mp4",
                     "mime_type": "video/mp4",
                     "file_size": 1024 * (i + 1),
+                    "status": "ready",
                 },
             )
 
@@ -457,6 +480,7 @@ class TestListAssets:
                 "name": "hello-world.mp4",
                 "storage_key": "uploads/hello.mp4",
                 "mime_type": "video/mp4",
+                "status": "ready",
             },
         )
         client.post(
@@ -467,6 +491,7 @@ class TestListAssets:
                 "name": "goodbye.mp4",
                 "storage_key": "uploads/goodbye.mp4",
                 "mime_type": "video/mp4",
+                "status": "ready",
             },
         )
 
@@ -768,6 +793,7 @@ class TestAssetsCRUDFlow:
                 "mime_type": "video/mp4",
                 "file_size": 8192,
                 "metadata": {"source": "test"},
+                "status": "ready",
             },
         )
         assert create_resp.status_code == 200