Switch menu source from Nutrislice to Claude-read PDF, weekly to monthly pull

The district discontinued Nutrislice in favor of a monthly PDF calendar
per grade band on kyrene.org. That PDF is a graphic calendar grid, not
reliably text-extractable, so scraper.py now sends it to Claude (vision +
structured JSON output) instead of hitting a JSON API. Fetches through a
stable Finalsite resource-manager permalink that always redirects to
whichever month is currently published, so no code change is needed each
month.

Also moves the pull schedule from weekly (day-of-week list) to monthly
(day-of-month), since the source itself is now monthly — defaults to the
25th, since the district tends to post next month's PDF a few days early.

Requires a new ANTHROPIC_API_KEY in the server's .env.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013RbBoYm23muVyMZ18Ldqa6

.env.example

@@ -6,12 +6,17 @@
 # e.g. http://192.168.86.X:8123/api/webhook/<random-token>
 HA_WEBHOOK_URL=
 
+# Anthropic API key. The district's lunch menu is now a graphic PDF
+# calendar (Nutrislice was discontinued), so scraper.py sends it to Claude
+# to read into structured data — see console.anthropic.com/settings/keys.
+ANTHROPIC_API_KEY=
+
 # --- Optional ---
-# Day(s) of week to pull the upcoming school week and push it to the
-# calendar (comma-separated: mon,tue,wed,thu,fri,sat,sun). Picking more
-# than one day creates duplicate events for days already pushed — most
-# people want just one.
-CALENDAR_RUN_DAYS=sun
+# Day of the month (1-28) to pull whichever month is currently published
+# and push it to the calendar. Re-pushing the same month creates duplicate
+# events, so pick one day near month-end (the district tends to post next
+# month's menu a few days early).
+CALENDAR_RUN_DAY_OF_MONTH=25
 
 # Time to run the pull (24-hour HH:MM, container timezone)
 CALENDAR_RUN_TIME=18:00