feat: use dateless Six Flags API endpoint for live today data

The API without a date param returns today's operating data directly,
invalidating the previous assumption that today's date was always missing.

- Add fetchToday(apiId, revalidate?) to sixflags.ts — calls the dateless
  endpoint with optional ISR cache
- Extract parseApiDay() helper shared by scrapeMonth and fetchToday
- Update upsertDay WHERE clause: >= date('now') so today can be updated
  (was > date('now'), which froze today after first write)
- scrape.ts: add a today-scrape pass after the monthly loop so each run
  always writes fresh today data to the DB
- app/page.tsx: fetch live today data for all parks (5-min ISR) and merge
  into the data map before computing open/closing/weatherDelay status
- app/park/[id]/page.tsx: prefer live today data from API for todayData
  so weather delays and hour changes surface within 5 minutes
- scrapeRidesForDay: update comment only — role unchanged (QT fallback)

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

lib/db.ts

@@ -46,12 +46,10 @@ export function upsertDay(
   hoursLabel?: string,
   specialType?: string
 ) {
-  // Today and past dates: INSERT new rows freely, but NEVER overwrite existing records.
-  // Once an operating day begins the API drops that date from its response, so a
-  // re-scrape would incorrectly record the day as closed. The DB row written when
-  // the date was still in the future is the permanent truth for that day.
+  // Today and future dates: full upsert — hours can change (e.g. weather delays,
+  // early closures) and the dateless API endpoint now returns today's live data.
   //
-  // Future dates only: full upsert — hours can change and closures can be added.
+  // Past dates: INSERT-only — never overwrite once the day has passed.
   db.prepare(`
     INSERT INTO park_days (park_id, date, is_open, hours_label, special_type, scraped_at)
     VALUES (?, ?, ?, ?, ?, ?)
@@ -60,7 +58,7 @@ export function upsertDay(
       hours_label  = excluded.hours_label,
       special_type = excluded.special_type,
       scraped_at   = excluded.scraped_at
-    WHERE park_days.date > date('now')
+    WHERE park_days.date >= date('now')
   `).run(parkId, date, isOpen ? 1 : 0, hoursLabel ?? null, specialType ?? null, new Date().toISOString());
 }