feat: add waitlist table and migration for tracking user signups

apps/web/migrations/0001_tricky_jackpot.sql

@@ -0,0 +1,8 @@
+CREATE TABLE "waitlist" (
+	"id" text PRIMARY KEY NOT NULL,
+	"email" text NOT NULL,
+	"created_at" timestamp NOT NULL,
+	CONSTRAINT "waitlist_email_unique" UNIQUE("email")
+);
+--> statement-breakpoint
+ALTER TABLE "waitlist" ENABLE ROW LEVEL SECURITY;