Initial Rails 8 scaffold for whetrails

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

config/cache.yml

@@ -0,0 +1,16 @@
+default: &default
+  store_options:
+    # Cap age of oldest cache entry to fulfill retention policies
+    # max_age: <%= 60.days.to_i %>
+    max_size: <%= 256.megabytes %>
+    namespace: <%= Rails.env %>
+
+development:
+  <<: *default
+
+test:
+  <<: *default
+
+production:
+  database: cache
+  <<: *default