Federal holidays in the app, national days from Checkiday in the app and/or exports

.env.example

@@ -40,5 +40,10 @@ EXTRACT_MODEL=nemotron-3.5-bolt:e4b
 # Days to keep photos after a scan is published.
 IMAGE_RETENTION_DAYS=90
 
+# National days ("National Chicken Sandwich Day"), shown when Settings > Holidays asks for them. Get a free key
+# (100 requests a month; this uses about 31) at https://marketplace.apilayer.com/checkiday-api. The free plan only
+# gives today's list, so each day's arrives that morning; days before you set this aren't filled in.
+# CHECKIDAY_API_KEY=
+
 # 1 adds a "Scan Stats" button to each scan's page (model, tokens, pages, events, scan time), for comparing models. Every scan's time is logged either way.
 # SHOW_SCAN_STATS=0