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/lib/ai/ai-error.ts

@@ -1,6 +1,7 @@
 import { NextResponse } from "next/server";
 import { APICallError } from "ai";
 import { checkAndIncrementTierLimit, refundAiCall, TierLimitError } from "@/lib/tiers";
+import { ByokDecryptError } from "@/lib/ai/resolve-user-key";
 
 /**
  * Maps an AI-call failure to a clean JSON response instead of letting the
@@ -23,6 +24,22 @@ export function aiErrorResponse(err: unknown): NextResponse {
   return NextResponse.json({ error: "AI request failed. Please try again." }, { status: 502 });
 }
 
+/**
+ * Resolves a BYOK/model config and converts a decrypt failure into a clean
+ * 400 response instead of letting it throw uncaught (or letting the caller
+ * silently fall back to the platform key/billing).
+ */
+export async function resolveAiConfigOrError<T>(resolve: () => Promise<T>): Promise<{ ok: true; data: T } | { ok: false; response: NextResponse }> {
+  try {
+    return { ok: true, data: await resolve() };
+  } catch (err) {
+    if (err instanceof ByokDecryptError) {
+      return { ok: false, response: NextResponse.json({ error: err.message }, { status: 400 }) };
+    }
+    throw err;
+  }
+}
+
 type QuotaResult<T> = { ok: true; data: T } | { ok: false; response: NextResponse };
 
 /**