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/ai/recipe-chat/route.ts

@@ -3,6 +3,7 @@ import { z } from "zod";
 import { generateText } from "ai";
 import { requireSession } from "@/lib/api-auth";
 import { applyRateLimit } from "@/lib/rate-limit";
+import { withAiQuota, resolveAiConfigOrError } from "@/lib/ai/ai-error";
 import { getModelConfigForUseCase } from "@/lib/ai/resolve-user-key";
 import { resolveModel } from "@/lib/ai/factory";
 import { db, recipes, eq, and } from "@epicure/db";
@@ -62,22 +63,26 @@ STEPS:
 ${stepList || "None listed"}
 `.trim();
 
-  const [config, privateBio] = await Promise.all([
-    getModelConfigForUseCase(session!.user.id, "text"),
+  const [configResult, privateBio] = await Promise.all([
+    resolveAiConfigOrError(() => getModelConfigForUseCase(session!.user.id, "text")),
     getUserPrivateBio(session!.user.id),
   ]);
-  const model = resolveModel(config);
+  if (!configResult.ok) return configResult.response;
+  const model = resolveModel(configResult.data);
   const bioContext = buildUserBioContext(privateBio);
   const locale = (session!.user as { locale?: string }).locale ?? "en";
   const lang = LANG[locale] ?? "English";
 
-  const { text } = await generateText({
-    model,
-    system: `You are a helpful culinary assistant. Answer questions about the following recipe concisely and accurately. If a question is not related to the recipe or cooking, politely redirect. Keep answers under 200 words. Respond in ${lang}.
+  const result = await withAiQuota(session!.user.id, session!.user.tier as "free" | "pro", () =>
+    generateText({
+      model,
+      system: `You are a helpful culinary assistant. Answer questions about the following recipe concisely and accurately. If a question is not related to the recipe or cooking, politely redirect. Keep answers under 200 words. Respond in ${lang}.
 
 ${recipeContext}${bioContext}`,
-    prompt: parsed.data.question,
-  });
+      prompt: parsed.data.question,
+    })
+  );
+  if (!result.ok) return result.response;
 
-  return NextResponse.json({ answer: text });
+  return NextResponse.json({ answer: result.data.text });
 }