feat: misc — cooking mode, OpenAPI docs, email, storage, upload, homepage

Cooking mode step-by-step view. OpenAPI 3.1 spec auto-generated from Zod schemas.
Email lib (resend). Redis client. S3 storage helper. Photo upload endpoint.
Landing page. Short recipe URL redirect /r/[id]. API docs page.

apps/web/app/api/v1/ai-keys/[provider]/route.ts

@@ -0,0 +1,18 @@
+import { NextResponse } from "next/server";
+import { db, userAiKeys, eq, and } from "@epicure/db";
+import { requireSession } from "@/lib/api-auth";
+
+type Params = { params: Promise<{ provider: string }> };
+
+export async function DELETE(_req: Request, { params }: Params) {
+  const { session, response } = await requireSession();
+  if (response) return response;
+
+  const { provider } = await params;
+
+  await db.delete(userAiKeys).where(
+    and(eq(userAiKeys.userId, session!.user.id), eq(userAiKeys.provider, provider))
+  );
+
+  return NextResponse.json({ ok: true });
+}