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/app/events/[id]/EventDetailClient.tsx

@@ -2,25 +2,17 @@
 
 import { useEffect, useState } from "react";
 import Link from "next/link";
-import { ArrowLeft, MapPin, Clock, Calendar, ExternalLink } from "lucide-react";
+import { ArrowLeft, MapPin, Clock, Calendar, ExternalLink, Building2 } from "lucide-react";
 import { api } from "@/lib/api";
 import { Navbar } from "@/components/public/Navbar";
 import { Footer } from "@/components/public/Footer";
-
-function formatFullDate(dateStr: string) {
-  const d = new Date(dateStr);
-  return d.toLocaleString("en-US", {
-    weekday: "long",
-    year: "numeric",
-    month: "long",
-    day: "numeric",
-  });
-}
+import { UpcomingEventsCarousel } from "@/components/public/UpcomingEventsCarousel";
+import { formatMeetupCivilDate, formatMeetupCivilDateLong, getMeetupStartUtc } from "@/lib/meetupEventTime";
 
 function DateBadge({ dateStr }: { dateStr: string }) {
-  const d = new Date(dateStr);
-  const month = d.toLocaleString("en-US", { month: "short" }).toUpperCase();
-  const day = String(d.getDate());
+  const civil = formatMeetupCivilDate(dateStr);
+  const month = civil?.monthShort ?? "—";
+  const day = civil?.day ?? "--";
   return (
     <div className="bg-zinc-800 rounded-xl px-4 py-3 text-center shrink-0 min-w-[60px]">
       <span className="block text-[11px] font-bold uppercase text-primary tracking-wider leading-none mb-1">
@@ -61,7 +53,12 @@ export default function EventDetailClient({ id }: { id: string }) {
       .finally(() => setLoading(false));
   }, [id]);
 
-  const isPast = meetup ? new Date(meetup.date) < new Date() : false;
+  const isPast = meetup
+    ? (() => {
+        const start = getMeetupStartUtc(meetup.date, meetup.time || "00:00");
+        return !Number.isNaN(start.getTime()) && start < new Date();
+      })()
+    : false;
 
   return (
     <>
@@ -115,10 +112,35 @@ export default function EventDetailClient({ id }: { id: string }) {
                 </div>
               </div>
 
+              <div className="flex flex-wrap gap-4 mb-6 text-sm text-on-surface-variant">
+                {meetup.organizer?.slug ? (
+                  <Link
+                    href={`/events/organizer/${meetup.organizer.slug}`}
+                    className="flex items-center gap-2 text-primary hover:underline underline-offset-4"
+                  >
+                    <Building2 size={15} className="text-primary/70 shrink-0" />
+                    <span>
+                      Organized by{" "}
+                      <span className="font-semibold">
+                        {meetup.organizer.name || "Belgian Bitcoin Embassy"}
+                      </span>
+                    </span>
+                  </Link>
+                ) : (
+                  <div className="flex items-center gap-2">
+                    <Building2 size={15} className="text-primary/70 shrink-0" />
+                    <span>
+                      Organized by{" "}
+                      {meetup.organizer?.name || "Belgian Bitcoin Embassy"}
+                    </span>
+                  </div>
+                )}
+              </div>
+
               <div className="flex flex-wrap gap-4 mb-10 text-sm text-on-surface-variant">
                 <div className="flex items-center gap-2">
                   <Calendar size={15} className="text-primary/70 shrink-0" />
-                  {formatFullDate(meetup.date)}
+                  {formatMeetupCivilDateLong(meetup.date)}
                 </div>
                 {meetup.time && (
                   <div className="flex items-center gap-2">
@@ -152,6 +174,8 @@ export default function EventDetailClient({ id }: { id: string }) {
                   Register for this event <ExternalLink size={16} />
                 </a>
               )}
+
+              <UpcomingEventsCarousel excludeId={meetup.id} />
             </>
           )}
         </div>

frontend/app/events/[id]/page.tsx

@@ -26,9 +26,10 @@ export async function generateMetadata({ params }: Props): Promise<Metadata> {
     return { title: "Event Not Found" };
   }
 
+  const orgLabel = event.organizer?.name || "Belgian Bitcoin Embassy";
   const description =
     event.description?.slice(0, 160) ||
-    `Bitcoin meetup: ${event.title}${event.location ? ` in ${event.location}` : ""}. Organized by the Belgian Bitcoin Embassy.`;
+    `Bitcoin meetup: ${event.title}${event.location ? ` in ${event.location}` : ""}. Organized by ${orgLabel}.`;
 
   const ogImage = event.imageId
     ? `/media/${event.imageId}`
@@ -69,6 +70,12 @@ export default async function EventDetailPage({ params }: Props) {
             location={event.location}
             url={`${siteUrl}/events/${id}`}
             imageUrl={event.imageId ? `${siteUrl}/media/${event.imageId}` : undefined}
+            organizerName={event.organizer?.name}
+            organizerUrl={
+              event.organizer?.slug
+                ? `${siteUrl}/events/organizer/${event.organizer.slug}`
+                : undefined
+            }
           />
           <BreadcrumbJsonLd
             items={[