feat: organizers, meetups UI, Plausible analytics, and migration tooling

- Add organizer model/API, admin and public organizer pages, meetup cards
- Refresh events/home/contact; add calendar dialog and carousel components
- Optional Plausible via NEXT_PUBLIC_PLAUSIBLE_* env vars in root layout
- Prisma migration, seed updates, baseline-and-migrate script

Made-with: Cursor

frontend/components/public/MeetupCard.tsx

@@ -0,0 +1,67 @@
+import Link from "next/link";
+import { MapPin, Clock, ArrowRight } from "lucide-react";
+import { formatMeetupCivilDate } from "@/lib/meetupEventTime";
+
+export function MeetupCard({ meetup, muted = false }: { meetup: any; muted?: boolean }) {
+  const civil = formatMeetupCivilDate(meetup.date);
+  const month = civil?.monthShort ?? "—";
+  const day = civil?.day ?? "--";
+  const full = civil?.full ?? "";
+  return (
+    <Link
+      href={`/events/${meetup.id}`}
+      className={`group flex flex-col bg-zinc-900 border rounded-xl p-6 hover:-translate-y-0.5 hover:shadow-xl transition-all duration-200 ${
+        muted
+          ? "border-zinc-800/60 opacity-70 hover:opacity-100 hover:border-zinc-700"
+          : "border-zinc-800 hover:border-zinc-700"
+      }`}
+    >
+      <div className="flex items-start gap-4 mb-4">
+        <div className={`rounded-lg px-3 py-2 text-center shrink-0 min-w-[52px] ${muted ? "bg-zinc-800/60" : "bg-zinc-800"}`}>
+          <span className={`block text-[10px] font-bold uppercase tracking-wider leading-none mb-0.5 ${muted ? "text-on-surface-variant/50" : "text-primary"}`}>
+            {month}
+          </span>
+          <span className="block text-2xl font-black leading-none">{day}</span>
+        </div>
+        <div className="min-w-0">
+          <h3 className="font-bold text-base leading-snug group-hover:text-primary transition-colors">
+            {meetup.title}
+          </h3>
+          <p className="text-on-surface-variant/60 text-xs mt-1">{full}</p>
+        </div>
+      </div>
+
+      {meetup.description && (
+        <p className="text-on-surface-variant text-sm leading-relaxed mb-4 flex-1 line-clamp-2">
+          {meetup.description}
+        </p>
+      )}
+
+      <p className="text-[11px] text-on-surface-variant/50 font-medium uppercase tracking-wide mb-2">
+        Organized by{" "}
+        <span className="text-on-surface-variant/70 normal-case tracking-normal">
+          {meetup.organizer?.name || "Belgian Bitcoin Embassy"}
+        </span>
+      </p>
+
+      <div className="flex flex-col gap-1.5 mt-auto pt-4 border-t border-zinc-800/60">
+        {meetup.location && (
+          <p className="flex items-center gap-1.5 text-xs text-on-surface-variant/60">
+            <MapPin size={12} className={`shrink-0 ${muted ? "text-on-surface-variant/40" : "text-primary/60"}`} />
+            {meetup.location}
+          </p>
+        )}
+        {meetup.time && (
+          <p className="flex items-center gap-1.5 text-xs text-on-surface-variant/60">
+            <Clock size={12} className={`shrink-0 ${muted ? "text-on-surface-variant/40" : "text-primary/60"}`} />
+            {meetup.time}
+          </p>
+        )}
+      </div>
+
+      <span className={`flex items-center gap-1.5 text-xs font-semibold mt-4 group-hover:gap-2.5 transition-all ${muted ? "text-on-surface-variant/50" : "text-primary"}`}>
+        View Details <ArrowRight size={12} />
+      </span>
+    </Link>
+  );
+}