refactor: splitting and reorganizing style files

packages/@core/shared/design/src/scss/base.scss

@@ -1,5 +1,4 @@
 #app,
-.ant-app,
 body,
 html {
   width: 100%;
@@ -7,10 +6,6 @@ html {
   overscroll-behavior: none;
 }
 
-.ant-app {
-  color: inherit;
-}
-
 *,
 ::after,
 ::before {

packages/@core/shared/design/src/scss/common/constants.scss

@@ -1,5 +0,0 @@
-$namespace: 'vben' !default;
-$common-separator: '-' !default;
-$element-separator: '__' !default;
-$modifier-separator: '--' !default;
-$state-prefix: 'is' !default;

packages/@core/shared/design/src/scss/global.scss

@@ -1,34 +0,0 @@
-@forward './common/constants.scss';
-
-@mixin b($block) {
-  $B: $namespace + '-' + $block !global;
-
-  .#{$B} {
-    @content;
-  }
-}
-
-@mixin e($name) {
-  @at-root {
-    &#{$element-separator}#{$name} {
-      @content;
-    }
-  }
-}
-
-@mixin m($name) {
-  @at-root {
-    &#{$modifier-separator}#{$name} {
-      @content;
-    }
-  }
-}
-
-// block__element.is-active {}
-@mixin is($state, $prefix: $state-prefix) {
-  @at-root {
-    &.#{$prefix}-#{$state} {
-      @content;
-    }
-  }
-}

packages/@core/shared/design/src/scss/index.scss

@@ -1,4 +1,4 @@
 /** css 样式重置 */
 @import 'modern-normalize/modern-normalize.css';
-@import './common/base';
+@import './base';
 @import './transition';