feat(sms): send class start date, days, and course time

Expose schedule fields on class and invoice templates so SMS can include Jalali start date, weekdays, and hour range.

components/settings/smsTemplates.test.js

@@ -58,4 +58,15 @@ describe('SMS template variables', () => {
     assert.deepEqual(merged.variables.map((item) => item.slot), ['amount', 'fullName', 'course']);
     assert.deepEqual(merged.variables.map((item) => item.name), ['PAYMENT_PRICE', 'FULLNAME', 'COURSE']);
   });
+
+  it('exposes class start date, class days, and course time slots', () => {
+    const expected = ['classStartDate', 'classDays', 'courseTime'];
+    for (const key of ['classRegistered', 'classReminder', 'invoiceCreated']) {
+      const def = SMS_TEMPLATE_DEFS.find((item) => item.key === key);
+      const slots = (def?.slots || []).map((slot) => slot.key);
+      for (const slot of expected) {
+        assert.ok(slots.includes(slot), `${key} is missing slot ${slot}`);
+      }
+    }
+  });
 });