Add event/organisation location with Google Maps links

Events and the organisation profile now have an address, with a
"Directions" link and an embedded Google Maps view (no API key
required) shown on event pages, event cards, and the Contact page.
New events default their location to the org's configured address.

frontend/src/components/events/EventCard.tsx

@@ -1,5 +1,5 @@
 import { ApiImage } from "@/components/shared/ApiImage";
-import { Calendar } from "lucide-react";
+import { Calendar, MapPin } from "lucide-react";
 import { ContactButton } from "@/components/events/ContactButton";
 
  type Event = {
@@ -17,6 +17,7 @@ import { ContactButton } from "@/components/events/ContactButton";
    contactName?: string | null;
    contactPhone?: string | null;
    contactEmail?: string | null;
+   location?: string | null;
 };
 
 import { formatDateTimeRange } from "@/lib/date";
@@ -40,6 +41,12 @@ export const EventCard = ({ event }: { event: Event }) => {
                         <Calendar className="w-3.5 h-3.5 shrink-0" />
                         {dateRange}
                     </p>
+                    {event.location && (
+                        <p className="text-sm text-gray-500 flex items-center gap-1.5 mt-1">
+                            <MapPin className="w-3.5 h-3.5 shrink-0" />
+                            <span className="truncate">{event.location}</span>
+                        </p>
+                    )}
                     <p className="text-sm text-gray-600 mt-2 line-clamp-2">{event.description}</p>
                 </div>
             </a>