feat: per-category email prefs, admin ops webhooks, per-user feature toggles (v0.61.0)

- Notification email preferences: every push category (follow, comment,
  reply, reaction, rating, mention, leftoverExpiring, shoppingList) now has
  an independent email toggle, plus a Weekly Digest toggle. Previously email
  sent unconditionally whenever the recipient had one; now gated the same
  way push already was. The weekly-digest cron route excludes opted-out
  users.

- Admin-only site-wide webhooks (Admin → Webhooks): new signups, support
  tickets, and reports filed can now fire an HMAC-signed HTTP webhook
  (Slack/Discord/ops alerting), independent of the existing per-user
  webhooks (which stay scoped to a user's own recipe/meal-plan/shopping-list
  events). Signing/delivery logic factored into lib/webhook-delivery.ts and
  shared by both dispatchers instead of duplicated.

- Settings → Features: users can hide Nutrition, Pantry, Meal Plan,
  Shopping Lists, Collections, or Messages from their own nav. Purely
  cosmetic — hidden pages stay reachable by direct link, nothing is
  access-restricted.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/app/api/v1/support/route.ts

@@ -6,6 +6,7 @@ import { requireSession } from "@/lib/api-auth";
 import { sendEmail, supportTicketReceivedHtml } from "@/lib/email";
 import { createGiteaIssue, buildGiteaIssueBody } from "@/lib/gitea";
 import { getPublicUrl, isOwnedSupportAttachmentKey } from "@/lib/storage";
+import { dispatchAdminWebhook } from "@/lib/admin-webhooks";
 
 const MAX_ATTACHMENTS = 5;
 
@@ -84,6 +85,8 @@ export async function POST(req: NextRequest) {
     updatedAt: now,
   });
 
+  void dispatchAdminWebhook("support_ticket.created", { id, userId: session!.user.id, type, title });
+
   if (attachments.length > 0) {
     await db.insert(supportTicketAttachments).values(
       attachments.map((a) => ({