v3: search engine, responsive header with compact user menu

.env.example

@@ -23,6 +23,13 @@ GERBEUR_ALLOWED_ORIGINS=http://localhost:3000,http://127.0.0.1:3000
 # Secret key used to sign JWTs. Generate with: openssl rand -hex 32
 GERBEUR_JWT_SECRET=
 
+# SMTP connection URL used by the email service (notifications, invites, etc.)
+# Example: smtps://username:password@smtp.example.com:465
+GERBEUR_SMTPS_URL=
+
+# Site name used in OG meta tags
+GERBEUR_SITE_NAME=gerbeur
+
 # ── Frontend (Vite) ───────────────────────────────────────────────────────────
 # These must be prefixed with VITE_ to be exposed to the client bundle.
 # They tell the frontend where the API server is reachable from the browser.