feat(backend): feed of deleted and edited messages with bulk deletions grouped and a shared seen marker

backend/src/api/app.py

@@ -25,6 +25,7 @@ from api.routers import (
     custom_emoji,
     discover,
     events,
+    feed,
     files,
     folders,
     media,
@@ -96,6 +97,7 @@ app.include_router(folders.router)
 app.include_router(backfill.router)
 app.include_router(search.router)
 app.include_router(chats.router)
+app.include_router(feed.router)
 app.include_router(media.router)
 app.include_router(avatars.router)
 app.include_router(custom_emoji.router)