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.

backend/prisma/migrations/20260821090459_add_event_location/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Event" ADD COLUMN     "location" TEXT;

backend/prisma/schema.prisma

@@ -105,6 +105,7 @@ model Event {
   contactName          String?
   contactPhone         String?
   contactEmail         String?
+  location             String?
   createdAt            DateTime          @default(now())
   updatedAt            DateTime          @updatedAt
   createdById          String?

backend/src/controllers/eventController.js

@@ -41,7 +41,7 @@ function toAbsoluteUrl(req, url) {
 // @access  Private/Admin
 const createEvent = async (req, res) => {
   try {
-    const { title, description, startDate, endDate, registrationDeadline, goLiveAt, price, picture, redirectUrl, isHidden, requiresAuth, requiresRegistration, contactName, contactPhone, contactEmail } = req.body;
+    const { title, description, startDate, endDate, registrationDeadline, goLiveAt, price, picture, redirectUrl, isHidden, requiresAuth, requiresRegistration, contactName, contactPhone, contactEmail, location } = req.body;
 
     const data = {
       id: uuidv4(),
@@ -62,6 +62,7 @@ const createEvent = async (req, res) => {
       contactName: contactName || null,
       contactPhone: contactPhone || null,
       contactEmail: contactEmail || null,
+      location: location || null,
     };
 
     try {
@@ -459,7 +460,7 @@ const updateEvent = async (req, res) => {
     // totals — same rule already enforced for payments/costs. Admin can reopen first.
     await assertEventOpen(req.params.id, res);
 
-    const { title, description, startDate, endDate, registrationDeadline, goLiveAt, price, picture, isActive, redirectUrl, isHidden, requiresAuth, requiresRegistration, contactName, contactPhone, contactEmail } = req.body;
+    const { title, description, startDate, endDate, registrationDeadline, goLiveAt, price, picture, isActive, redirectUrl, isHidden, requiresAuth, requiresRegistration, contactName, contactPhone, contactEmail, location } = req.body;
 
     const data = {
       title: title || event.title,
@@ -477,6 +478,7 @@ const updateEvent = async (req, res) => {
       contactName: contactName !== undefined ? (contactName || null) : event.contactName,
       contactPhone: contactPhone !== undefined ? (contactPhone || null) : event.contactPhone,
       contactEmail: contactEmail !== undefined ? (contactEmail || null) : event.contactEmail,
+      location: location !== undefined ? (location || null) : event.location,
       updatedAt: new Date(),
       redirectUrl: redirectUrl !== undefined ? redirectUrl : event.redirectUrl,
     };