feat(website/matchers): add @Format location to Location interface (#1630)

Tag the Location interface with @Format location so the Studio can render
a purpose-built widget for city/regionCode/country instead of three free
text inputs (which are easy to typo silently).

No runtime change — matcher logic and expected data shapes are untouched.
Existing configured values keep working; falls back to default rendering
until a Studio-side widget for `location` lands.

Mirrors the equivalent change on decocms/apps-start #84.

Author: guitavano

website/matchers/location.ts

@@ -13,6 +13,9 @@ export interface Map {
    */
   coordinates?: MapWidget;
 }
+/**
+ * @format location
+ */
 export interface Location {
   /**
    * @title City