Add Pitopn digital shop with FastAPI, Postgres 17, and Docker Compose

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

app/static/js/main.js

@@ -0,0 +1,39 @@
+(() => {
+  const toast = document.getElementById("toast");
+  let toastTimer;
+
+  const showToast = (message) => {
+    if (!toast) return;
+    toast.hidden = false;
+    toast.textContent = message;
+    clearTimeout(toastTimer);
+    toastTimer = setTimeout(() => {
+      toast.hidden = true;
+    }, 2600);
+  };
+
+  document.querySelectorAll("[data-buy]").forEach((button) => {
+    button.addEventListener("click", () => {
+      const slug = button.getAttribute("data-buy");
+      showToast(`«${slug}» — оплата скоро будет подключена`);
+    });
+  });
+
+  const reveals = document.querySelectorAll(".reveal");
+  if ("IntersectionObserver" in window) {
+    const observer = new IntersectionObserver(
+      (entries) => {
+        entries.forEach((entry) => {
+          if (entry.isIntersecting) {
+            entry.target.classList.add("is-visible");
+            observer.unobserve(entry.target);
+          }
+        });
+      },
+      { threshold: 0.15 }
+    );
+    reveals.forEach((el) => observer.observe(el));
+  } else {
+    reveals.forEach((el) => el.classList.add("is-visible"));
+  }
+})();