fix: audit fixes — tier-quota bypass, webhook SSRF, auth hardening, pagination, a11y

Full audit (bugs/UI-UX/backend/feature-gap) turned up a money-leak AI quota
bypass, webhook SSRF, and a long tail of missing pagination/auth/a11y work.
Fixes land together since HANDOFF.md tracked them as one backlog.

- AI routes charge tier quota before generating; nutrition POST is author-only
- Webhook dispatch re-validates URL per delivery (SSRF/DNS-rebinding), treats
  redirects as failures; recipe.published now actually dispatches
- New indexes/unique constraints on recipes, meal-planning, comments FK cascade
- Recipe PUT/restore snapshot only inside the transaction, after validation
- Recipe DELETE cleans up S3 objects (recipe + review photos)
- Optimistic UI (favorite/star/follow/shopping-list) rolls back on failure
- Upload presign enforces file size cap + per-tier storage quota
- Route-level loading/error/not-found states across (app), admin, and root
- middleware.ts guards (app)/admin; requireAdmin checks DB role, not cached
  session; rate limiting applied to both session and API-key branches,
  bucketed per key; Stripe webhook dedupes by event id
- Pagination added to recipes, feed, profile, comments, pantry, admin tables
- Nav shows real avatar + profile link + dark-mode toggle; destructive actions
  standardized on AlertDialog
- Unsaved-changes guard + real ingredient/step validation on recipe form;
  canonical /recipes/[id] used in-app; next/image migration; aria-labels and
  alt text across icon buttons, avatars, recipe photos
- packages/api-types removed (zero callers, too drifted to safely rewire);
  openapi.ts and ai-keys error shape drift fixed; BYOK decrypt failures now
  surface instead of silently falling back to the platform key

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

apps/web/app/api/v1/feed/for-you/route.ts

@@ -10,6 +10,8 @@ export async function GET(req: NextRequest) {
 
   const { searchParams } = new URL(req.url);
   const limit = Math.min(parseInt(searchParams.get("limit") ?? "20"), 50);
+  const offsetRaw = parseInt(searchParams.get("offset") ?? "0");
+  const offset = Number.isNaN(offsetRaw) ? 0 : Math.max(0, offsetRaw);
 
   // Recipes the user has favorited, or rated 4+, define their taste profile.
   const [favoritedRows, highRatedRows] = await Promise.all([
@@ -60,10 +62,12 @@ export async function GET(req: NextRequest) {
     ? rankForYou(candidates, preferences)
     : [...candidates].sort((a, b) => b.createdAt.getTime() - a.createdAt.getTime());
 
-  const data = ranked.slice(0, limit).map(({ tags: _tags, dietaryTags: _dietaryTags, ...r }) => ({
+  const data = ranked.slice(offset, offset + limit).map(({ tags: _tags, dietaryTags: _dietaryTags, ...r }) => ({
     ...r,
     createdAt: r.createdAt.toISOString(),
   }));
 
-  return NextResponse.json({ data });
+  // `ranked` is capped to a bounded recent window (see `candidates` query above), so this
+  // total reflects the size of that ranked window rather than every eligible recipe.
+  return NextResponse.json({ data, total: ranked.length, limit, offset });
 }