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

.env.example

@@ -4,9 +4,12 @@ ADMIN_PUBKEYS=npub1examplepubkey1,npub1examplepubkey2
 # Nostr relays (comma-separated)
 RELAYS=wss://relay.damus.io,wss://nos.lol,wss://relay.nostr.band
 
-# Database (path is relative to backend/prisma/ when using file: URLs — see Prisma docs)
-# Apply schema: from repo root run `npm run db:push`, or from backend run `npm run db:push`.
-# Do not run bare `npx prisma db push` from the repo root (no schema there; wrong Prisma version).
+# Database (path is relative to the backend working directory for file: URLs — keep deploy cwd consistent)
+# After pulling code: from backend run `npm run migrate:deploy` (or `npm run db:migrate`) so migrations
+# run in order. Do not rely on `db:push` for upgrades that add required columns to non-empty tables.
+#
+# If migrate fails with P3005 (schema not empty / no migration history, e.g. DB was created with db push),
+# from backend run once: `npm run db:baseline-and-migrate` (see scripts/baseline-and-migrate.sh).
 DATABASE_URL="file:./dev.db"
 
 # JWT
@@ -25,6 +28,12 @@ NEXT_PUBLIC_SITE_URL=https://belgianbitcoinembassy.org
 NEXT_PUBLIC_SITE_TITLE=Belgian Bitcoin Embassy
 NEXT_PUBLIC_SITE_TAGLINE=Belgium's Monthly Bitcoin Meetup
 
+# Plausible analytics (optional; both must be set or the script is omitted)
+# Tracked site domain (data-domain). Example: belgianbitcoinembassy.org
+NEXT_PUBLIC_PLAUSIBLE_DOMAIN=belgianbitcoinembassy.org
+# Plausible / custom analytics host origin, no trailing slash. Example: https://analytics.azzamo.net
+NEXT_PUBLIC_PLAUSIBLE_ANALYTICS_ORIGIN=https://analytics.azzamo.net
+
 # Message board (Lightning / LNbits) — backend
 MESSAGE_PRICE_SATS=1000
 LNBITS_API_KEY=