Implement PWA optimizations with advanced caching and install features

Co-authored-by: jxxghp <jxxghp@163.com>

public/loader.css

@@ -1,97 +0,0 @@
-#loading-bg {
-  position: fixed;
-  z-index: 99999;
-  display: block;
-  background: var(--initial-loader-bg, #fff);
-  block-size: 100vh;
-  inline-size: 100vw;
-  transition: opacity 0.8s ease, transform 0.8s ease, filter 0.8s ease;
-}
-
-.loading-logo {
-  position: absolute;
-  inset-block-start: 35%;
-  inset-inline-start: calc(50% - 5rem);
-  transition: opacity 0.8s ease, transform 0.8s ease, filter 0.8s ease;
-}
-
-/* 添加logo完成动画 - 放大虚化效果 */
-.loading-complete .loading-logo {
-  filter: blur(10px);
-  opacity: 0;
-  transform: scale(1.5);
-}
-
-/* 添加加载背景消失动画 - 放大虚化效果 */
-.loading-complete {
-  filter: blur(15px);
-  opacity: 0;
-  transform: scale(1.2);
-}
-
-.loading {
-  position: absolute;
-  box-sizing: border-box;
-  border: 3px solid transparent;
-  border-radius: 50%;
-  block-size: 55px;
-  inline-size: 55px;
-  inset-block-start: 80%;
-  inset-inline-start: calc(50% - 27.5px);
-  transition: opacity 0.6s ease;
-}
-
-/* 完成时隐藏加载动画 */
-.loading-complete .loading {
-  opacity: 0;
-}
-
-.loading .effect-1,
-.loading .effect-2,
-.loading .effect-3 {
-  position: absolute;
-  box-sizing: border-box;
-  border: 3px solid transparent;
-  border-radius: 50%;
-  block-size: 100%;
-  border-inline-start: 3px solid var(--initial-loader-color, #eee);
-  inline-size: 100%;
-}
-
-.loading .effect-1 {
-  animation: rotate 1s ease infinite;
-}
-
-.loading .effect-2 {
-  animation: rotate-opacity 1s ease infinite 0.1s;
-}
-
-.loading .effect-3 {
-  animation: rotate-opacity 1s ease infinite 0.2s;
-}
-
-.loading .effects {
-  transition: all 0.3s ease;
-}
-
-@keyframes rotate {
-  0% {
-    transform: rotate(0deg);
-  }
-
-  100% {
-    transform: rotate(1turn);
-  }
-}
-
-@keyframes rotate-opacity {
-  0% {
-    opacity: 0.1;
-    transform: rotate(0deg);
-  }
-
-  100% {
-    opacity: 1;
-    transform: rotate(1turn);
-  }
-}