Refactor font handling and theme config, switch to CodeMirror editor

Replaces Monaco editor with CodeMirror in the frontend, removing related dependencies and configuration. Refactors font management to support multiple formats (woff, woff2, ttf, otf) and dynamic font switching, including backend API and frontend theme config UI. Adds gzip compression middleware to backend. Updates theme config to allow font selection and custom font upload, and improves theme preview and color customization UI. Cleans up unused code and improves sidebar and terminal font sizing responsiveness.

packages/napcat-webui-frontend/src/styles/fonts.css

@@ -1,16 +1,10 @@
 @font-face {
-  font-family: 'Aa偷吃可爱长大的';
-  src: url('/fonts/AaCute.woff') format('woff');
-  font-display: swap;
+  font-family: 'JetBrains Mono';
+  src: url('/webui/fonts/JetBrainsMono.ttf') format('truetype');
 }
 
 @font-face {
   font-family: 'JetBrains Mono';
-  src: url('/fonts/JetBrainsMono.ttf') format('truetype');
-}
-
-@font-face {
-  font-family: 'JetBrains Mono';
-  src: url('/fonts/JetBrainsMono-Italic.ttf') format('truetype');
+  src: url('/webui/fonts/JetBrainsMono-Italic.ttf') format('truetype');
   font-style: italic;
 }

packages/napcat-webui-frontend/src/styles/globals.css

@@ -5,20 +5,7 @@
 @tailwind utilities;
 
 body {
-  font-family:
-    'Aa偷吃可爱长大的',
-    'Quicksand',
-    'Nunito',
-    'Inter',
-    -apple-system,
-    BlinkMacSystemFont,
-    'Segoe UI',
-    Roboto,
-    'Helvetica Neue',
-    Arial,
-    'PingFang SC',
-    'Microsoft YaHei',
-    sans-serif !important;
+  font-family: var(--font-family-base, 'Quicksand', 'Nunito', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif) !important;
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
   text-rendering: optimizeLegibility;
@@ -27,6 +14,9 @@ body {
 }
 
 :root {
+  /* 字体变量：可被 JS 动态覆盖 */
+  --font-family-fallbacks: 'Quicksand', 'Nunito', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
+  --font-family-base: var(--font-family-fallbacks);
   --heroui-primary: 217.2 91.2% 59.8%;
   /* 自然的现代蓝 */
   --heroui-primary-foreground: 210 40% 98%;
@@ -152,22 +142,4 @@ h6 {
 
 .ql-editor img {
   @apply inline-block;
-}
-
-/* GPU-accelerated navigation indicator animation */
-@keyframes nav-indicator-spin {
-  0% {
-    transform: rotate(0deg) translateZ(0);
-  }
-
-  100% {
-    transform: rotate(360deg) translateZ(0);
-  }
-}
-
-.animate-nav-spin {
-  animation: nav-indicator-spin 2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
-  will-change: transform;
-  backface-visibility: hidden;
-  perspective: 1000px;
 }