adding features for social network

backend/social/nápady_nebo_chybějicí.md

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+# Social Feature Ideas
+
+## Hub
+- Hub visibility flag (`is_public`) — private/public hubs
+- Hub owner transfer (current owner passes ownership to another member)
+
+## Chat
+- Chat type field (DM vs group) — enforce 2-member limit on DMs
+- Message soft-delete (`is_deleted` flag) — preserve reply context when a message is removed
+
+## Posts
+- Post reactions/likes — equivalent of MessageReaction but for posts
+- Post comments — a `Comment` model FK-ing to `Post`
+- Upvote/downvote system for posts — reddit style voting with score and sorting by "hotness"
+
+## Users
+- User blocking — affects message/post visibility across all social features