feat(notifications): Add bot owner notifications for interactions

- Create new botOwnerNotify module with notifyBotOwnerForPost and notifyBotOwnerForFollow functions
- Add bot owner notifications to local post interactions (likes, reposts)
- Add bot owner notifications to swarm post interactions (likes, reposts, mentions)
- Add bot owner notifications to follow interactions (local and swarm)
- Implement mention notification creation for local mentions in post creation
- Notify bot owners when their bots receive interactions from other users
- Ensure bot owners are alerted to engagement on their bot accounts across federated network

src/app/api/users/[handle]/follow/route.ts

@@ -268,6 +268,10 @@ export async function POST(request: Request, context: RouteContext) {
                 actorId: currentUser.id,
                 type: 'follow',
             });
+
+            // Also notify bot owner if this is a bot being followed
+            const { notifyBotOwnerForFollow } = await import('@/lib/notifications/botOwnerNotify');
+            await notifyBotOwnerForFollow(targetUser.id, currentUser.id);
         }
 
         // Update counts