Replace BPS Excel stub with multi-client calendar template.

Official download now generates a blank workbook with catalog autofill, notas_internas ignored on import, and the same template for every tenant.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/generate_calendar_template.ts

@@ -0,0 +1,22 @@
+/**
+ * Regenerate public/plantillas/calendario-rrss-oficial.xlsx
+ *   npx tsx scripts/generate_calendar_template.ts
+ */
+import { writeFileSync } from 'fs';
+import { resolve } from 'path';
+import { buildOfficialXlsx } from '../src/lib/calendar-template';
+
+async function main() {
+  const { buffer, filename } = await buildOfficialXlsx('CLIENTE');
+  const out = resolve(
+    process.cwd(),
+    'public/plantillas/calendario-rrss-oficial.xlsx'
+  );
+  writeFileSync(out, buffer);
+  console.log('Wrote', out, `(${buffer.length} bytes) · ${filename}`);
+}
+
+main().catch((e) => {
+  console.error(e);
+  process.exit(1);
+});