feat: интерактивный установщик install.sh (Docker / Ubuntu, админ, БД)

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

src/public/css/style.css

@@ -547,6 +547,106 @@ a:hover {
   border-radius: 6px;
 }
 
+.cart-sidebar {
+  display: grid;
+  gap: 1rem;
+  margin-top: 1.25rem;
+  max-width: 420px;
+}
+
+@media (min-width: 900px) {
+  .cart-table-wrap {
+    display: grid;
+    grid-template-columns: 1fr minmax(280px, 360px);
+    gap: 1.5rem;
+    align-items: start;
+  }
+
+  .cart-sidebar {
+    margin-top: 0;
+  }
+}
+
+.promo-box__title {
+  margin: 0 0 0.75rem;
+  font-size: 1rem;
+}
+
+.promo-box__form {
+  display: flex;
+  gap: 0.5rem;
+  flex-wrap: wrap;
+}
+
+.promo-box__form .input {
+  flex: 1;
+  min-width: 120px;
+}
+
+.promo-box__applied {
+  margin: 0 0 0.5rem;
+}
+
+.promo-box__discount {
+  color: var(--success);
+  margin: 0 0 0.5rem;
+}
+
+.promo-countdown {
+  font-size: 0.9rem;
+  margin: 0.5rem 0;
+  padding: 0.5rem 0.75rem;
+  background: rgba(253, 203, 110, 0.12);
+  border-radius: 8px;
+  border: 1px solid rgba(253, 203, 110, 0.35);
+}
+
+.promo-countdown__timer {
+  font-weight: 600;
+  color: var(--warn);
+  font-variant-numeric: tabular-nums;
+}
+
+.promo-countdown__timer--ended {
+  color: var(--error);
+}
+
+.cart-summary__dl {
+  margin: 0 0 1rem;
+}
+
+.cart-summary__dl dt {
+  color: var(--muted);
+  font-size: 0.9rem;
+}
+
+.cart-summary__dl dd {
+  margin: 0 0 0.5rem;
+  text-align: right;
+}
+
+.cart-summary__dl dt,
+.cart-summary__dl dd {
+  display: inline-block;
+  width: 48%;
+  vertical-align: top;
+}
+
+.cart-summary__discount {
+  color: var(--success);
+}
+
+.cart-summary__total-label,
+.cart-summary__total {
+  font-size: 1.1rem;
+  font-weight: 600;
+}
+
+.checkout-promo {
+  font-size: 0.9rem;
+  margin: 0.75rem 0;
+}
+
 .cart-actions {
   display: flex;
   flex-wrap: wrap;