Remove the seriouscritter notifications section

Reverts 6537c34 and its syntax fix 4bdfae1. The section only regrouped a
user's own notifications from that account (duplicating them in the list),
and the actorId filter it added to listNotifications was never used.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FQFD3mtUWSZpeLbKzkCohh

apps/api/src/services/notifications.ts

@@ -103,27 +103,15 @@ export async function toNotificationDTOs(rows: Row[]): Promise<NotificationDTO[]
 }
 
 /** Newest first, 30 at a time; the cursor is the last one's time. */
-export async function listNotifications(
-  userId: string,
-  cursor: string | null,
-  actorId?: string // Added optional actorId filter
-): Promise<{
-  notifications: NotificationDTO[];
-  unread: number;
-  nextCursor: string | null;
-}> {
+export async function listNotifications(userId: string, cursor: string | null) {
   const n = schema.notifications;
   const before = cursor ? new Date(cursor) : null;
-  const query = db
+  const rows = await db
     .select()
     .from(n)
-    .where(and(
-      eq(n.userId, userId),
-      before && !isNaN(before.getTime()) ? lt(n.createdAt, before) : undefined,
-      actorId ? eq(n.actorId, actorId) : undefined // Apply actor filter if provided
-    ));
-
-  const rows = await query.orderBy(desc(n.createdAt)).limit(31);
+    .where(and(eq(n.userId, userId), before && !isNaN(before.getTime()) ? lt(n.createdAt, before) : undefined))
+    .orderBy(desc(n.createdAt))
+    .limit(31);
   const page = rows.slice(0, 30);
   return {
     notifications: await toNotificationDTOs(page),