🔧 웹훅 URL을 HTTPS로 수정

- 웹훅 URL을 https://admin.youtooplay.com/webhook로 변경
- Nginx 리버스 프록시 설정 파일 추가
- 배포 가이드 업데이트

@core/scss/base/placeholders/_default-layout-vertical-nav.scss

@@ -0,0 +1,45 @@
+@use "@configured-variables" as variables;
+@use "misc";
+@use "@core/scss/base/mixins";
+
+%default-layout-vertical-nav-scrolled-sticky-elevated-nav {
+  background-color: rgb(var(--v-theme-surface));
+}
+
+%default-layout-vertical-nav-floating-navbar-and-sticky-elevated-navbar-scrolled {
+  @include mixins.elevation(variables.$vertical-nav-navbar-elevation);
+
+  // If navbar is contained => Squeeze navbar content on scroll
+  @if variables.$layout-vertical-nav-navbar-is-contained {
+    padding-inline: 1.2rem;
+  }
+}
+
+%default-layout-vertical-nav-floating-navbar-overlay {
+  isolation: isolate;
+
+  &::after {
+    position: absolute;
+    z-index: -1;
+    /* stylelint-disable property-no-vendor-prefix */
+    -webkit-backdrop-filter: blur(10px);
+    backdrop-filter: blur(10px);
+    /* stylelint-enable */
+    background:
+      linear-gradient(
+        180deg,
+        rgba(var(--v-theme-background), 70%) 44%,
+        rgba(var(--v-theme-background), 43%) 73%,
+        rgba(var(--v-theme-background), 0%)
+      );
+    background-repeat: repeat;
+    block-size: calc(variables.$layout-vertical-nav-navbar-height + variables.$vertical-nav-floating-navbar-top + 0.5rem);
+    content: "";
+    inset-block-start: -(variables.$vertical-nav-floating-navbar-top);
+    inset-inline: 0 0;
+    /* stylelint-disable property-no-vendor-prefix */
+    -webkit-mask: linear-gradient(black, black 18%, transparent 100%);
+    mask: linear-gradient(black, black 18%, transparent 100%);
+    /* stylelint-enable */
+  }
+}