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/lib/redis.ts

@@ -0,0 +1,16 @@
+import Redis from "ioredis";
+
+declare global {
+  // eslint-disable-next-line no-var
+  var __redis: Redis | undefined;
+}
+
+export function getRedis(): Redis {
+  if (!globalThis.__redis) {
+    globalThis.__redis = new Redis(
+      process.env["REDIS_URL"] ?? "redis://localhost:6379",
+      { lazyConnect: false, maxRetriesPerRequest: 3 }
+    );
+  }
+  return globalThis.__redis;
+}