Add product carousel module with template and database structure

- Created `pp_carousel.tpl` for rendering product carousel with Swiper integration.
- Added `plan.md` detailing module architecture, database schema, and implementation steps.
- Initialized log files for development and production environments.

modules/pp_carousel/views/js/pp_carousel.js

@@ -0,0 +1,23 @@
+document.addEventListener('DOMContentLoaded', function () {
+  if (typeof Swiper === 'undefined') return;
+
+  document.querySelectorAll('.pp-carousel__slider.swiper').forEach(function (el) {
+    var section = el.closest('.pp-carousel');
+    if (!section) return;
+
+    new Swiper(el, {
+      slidesPerView: 3,
+      spaceBetween: 26,
+      loop: false,
+      navigation: {
+        nextEl: section.querySelector('.pp-carousel__next'),
+        prevEl: section.querySelector('.pp-carousel__prev')
+      },
+      breakpoints: {
+        0:   { slidesPerView: 1.15, spaceBetween: 16 },
+        576: { slidesPerView: 2,    spaceBetween: 18 },
+        992: { slidesPerView: 3,    spaceBetween: 26 }
+      }
+    });
+  });
+});