add social interactions, rich media metadata, and workspace description

app/models/__init__.py

@@ -5,6 +5,8 @@ from .follow import Follow
 from .workspace import Workspace, WorkspaceMember
 from .project import ProjectNode
 from .library import LibraryItem
+# 引入新交互表
+from .interaction import ProjectLike, ProjectFavorite, ProjectShare
 
 __all__ = [
     "Base", 
@@ -14,5 +16,8 @@ __all__ = [
     "Workspace", 
     "WorkspaceMember", 
     "ProjectNode", 
-    "LibraryItem"
+    "LibraryItem",
+    "ProjectLike",
+    "ProjectFavorite",
+    "ProjectShare"
 ]