新增点赞收藏功能：cloud_favorites 模型、查询/设置点赞状态及收藏列表接口

app/schemas.py

@@ -262,3 +262,16 @@ class ProfileStatsOut(BaseModel):
     cloud_count: int
     public_cloud_count: int
     collection_count: int
+
+
+class FavoriteIn(BaseModel):
+    """设置或取消对照片的点赞收藏。"""
+
+    favorited: bool
+
+
+class FavoriteOut(BaseModel):
+    cloud_id: uuid.UUID
+    user_id: uuid.UUID
+    favorited: bool
+    favorite_count: int