add cache interceptor for hot endpoints

src/common/constants/cache-keys.constant.ts

@@ -0,0 +1,14 @@
+/** Default TTL (seconds) for public read endpoints */
+export const PUBLIC_CACHE_TTL = 300;
+
+export const CacheKeyPrefixes = {
+  FOODS_BY_RESTAURANT: 'public:foods:restaurant',
+  CATEGORIES_BY_RESTAURANT: 'public:categories:restaurant',
+  RESTAURANT_SPEC: 'public:restaurants',
+} as const;
+
+export const CacheKeys = {
+  foodsByRestaurant: (slug: string) => `${CacheKeyPrefixes.FOODS_BY_RESTAURANT}:${slug}`,
+  categoriesByRestaurant: (slug: string) => `${CacheKeyPrefixes.CATEGORIES_BY_RESTAURANT}:${slug}`,
+  restaurantSpec: (slug: string) => `${CacheKeyPrefixes.RESTAURANT_SPEC}:${slug}`,
+} as const;