feat: retention days limit and clone name templating and useful descr.

templates/schedule.html

@@ -36,6 +36,13 @@
     <label>Fixed check times
       <textarea name="fixed_times" rows="3" required>{{ schedule.fixed_times | join(",") }}</textarea>
     </label>
+    <fieldset>
+      <legend>Clone presentation</legend>
+      <label>Clone name template
+        <input name="clone_name_template" value="{{ schedule.clone_name_template }}" required>
+      </label>
+      <p class="muted">Use <code>{type}</code>, <code>{date}</code>, and <code>{clone}</code>. The template must include <code>{clone}</code> so generated workouts remain identifiable.</p>
+    </fieldset>
     <button type="submit">Save schedule</button>
   </form>
 </section>