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/organizer/[slug]/OrganizerEventsClient.tsx

@@ -0,0 +1,153 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import Link from "next/link";
+import { api } from "@/lib/api";
+import { getMeetupStartUtc } from "@/lib/meetupEventTime";
+import { Navbar } from "@/components/public/Navbar";
+import { Footer } from "@/components/public/Footer";
+import { MeetupCard } from "@/components/public/MeetupCard";
+import { AddToCalendarButton } from "@/components/public/AddToCalendarDialog";
+import { ArrowLeft } from "lucide-react";
+
+function CardSkeleton() {
+  return (
+    <div className="bg-zinc-900 border border-zinc-800 rounded-xl p-6 animate-pulse">
+      <div className="flex items-start gap-4 mb-4">
+        <div className="bg-zinc-800 rounded-lg w-[52px] h-[58px] shrink-0" />
+        <div className="flex-1 space-y-2">
+          <div className="h-4 bg-zinc-800 rounded w-3/4" />
+          <div className="h-3 bg-zinc-800 rounded w-1/2" />
+        </div>
+      </div>
+    </div>
+  );
+}
+
+export default function OrganizerEventsClient({
+  slug,
+  organizerName,
+}: {
+  slug: string;
+  organizerName: string;
+}) {
+  const [meetups, setMeetups] = useState<any[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+
+  useEffect(() => {
+    setLoading(true);
+    api
+      .getMeetups({ organizerSlug: slug })
+      .then((data: any) => {
+        const list = Array.isArray(data) ? data : [];
+        setMeetups(list);
+      })
+      .catch((err) => setError(err.message))
+      .finally(() => setLoading(false));
+  }, [slug]);
+
+  const now = new Date();
+  const upcoming = meetups.filter((m) => {
+    const start = getMeetupStartUtc(m.date, m.time || "00:00");
+    if (Number.isNaN(start.getTime())) return false;
+    return start >= now;
+  });
+  const past = meetups
+    .filter((m) => {
+      const start = getMeetupStartUtc(m.date, m.time || "00:00");
+      if (Number.isNaN(start.getTime())) return false;
+      return start < now;
+    })
+    .reverse();
+
+  return (
+    <>
+      <Navbar />
+      <div className="min-h-screen">
+        <header className="pt-24 pb-12 px-8">
+          <div className="max-w-6xl mx-auto">
+            <Link
+              href="/events"
+              className="inline-flex items-center gap-2 text-on-surface-variant hover:text-primary transition-colors mb-6 text-sm font-medium"
+            >
+              <ArrowLeft size={16} />
+              All events
+            </Link>
+            <p className="uppercase tracking-[0.2em] text-primary mb-2 font-semibold text-xs">
+              Organizer
+            </p>
+            <h1 className="text-4xl md:text-5xl font-black tracking-tighter mb-4">
+              {organizerName}
+            </h1>
+            <p className="text-on-surface-variant max-w-md leading-relaxed">
+              Upcoming and past events hosted by this organizer.
+            </p>
+          </div>
+        </header>
+
+        <div className="max-w-6xl mx-auto px-8 pb-24 space-y-20">
+          {error && (
+            <div className="bg-red-900/20 text-red-400 rounded-xl p-6 text-sm">
+              Failed to load events: {error}
+            </div>
+          )}
+
+          <div>
+            <div className="flex items-center justify-between mb-8">
+              <h2 className="text-xl font-black flex items-center gap-3">
+                Upcoming
+                {!loading && upcoming.length > 0 && (
+                  <span className="text-xs font-bold bg-primary/10 text-primary px-2.5 py-1 rounded-full">
+                    {upcoming.length}
+                  </span>
+                )}
+              </h2>
+              <AddToCalendarButton />
+            </div>
+
+            {loading ? (
+              <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-5">
+                {[0, 1, 2].map((i) => (
+                  <CardSkeleton key={i} />
+                ))}
+              </div>
+            ) : upcoming.length === 0 ? (
+              <div className="border border-zinc-800/60 rounded-xl px-8 py-12 text-center">
+                <p className="text-on-surface-variant text-sm">
+                  No upcoming events from this organizer.
+                </p>
+              </div>
+            ) : (
+              <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-5">
+                {upcoming.map((m) => (
+                  <MeetupCard key={m.id} meetup={m} />
+                ))}
+              </div>
+            )}
+          </div>
+
+          {(loading || past.length > 0) && (
+            <div>
+              <h2 className="text-xl font-black mb-8 text-on-surface-variant/60">Past events</h2>
+              {loading ? (
+                <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-5">
+                  {[0, 1, 2].map((i) => (
+                    <CardSkeleton key={i} />
+                  ))}
+                </div>
+              ) : (
+                <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-5">
+                  {past.map((m) => (
+                    <MeetupCard key={m.id} meetup={m} muted />
+                  ))}
+                </div>
+              )}
+            </div>
+          )}
+        </div>
+      </div>
+      <Footer />
+    </>
+  );
+}