Code refactoring (#2865)

* refactor: use vue inline styles in entire application

* refactor: setting row in dashboard page

* refactor: use blob for download file in text modal

* refactor: move all html templates in `web/html` folder

* refactor: `DeviceUtils` -> `MediaQueryMixin`
The transition to mixins has been made, as they can update themselves.

* chore: pretty right buttons in `outbounds` tab in xray settings

* refactor: add translations for system status

* refactor: adjust gutter spacing in setting list item

* refactor: use native `a-input-password` for password field

* chore: return old system status
with new translations

* chore: add missing translation

web/html/component/aCustomStatistic.html

@@ -0,0 +1,42 @@
+{{define "component/customStatistic"}}
+<template>
+    <a-statistic :title="title" :value="value">
+        <template #prefix>
+            <slot name="prefix"></slot>
+        </template>
+        <template #suffix>
+            <slot name="suffix"></slot>
+        </template>
+    </a-statistic>
+</template>
+{{end}}
+
+{{define "component/aCustomStatistic"}}
+<style>
+  .dark .ant-statistic-content {
+    color: var(--dark-color-text-primary)
+  }
+  .dark .ant-statistic-title {
+    color: rgba(255, 255, 255, 0.55)
+  }
+  .ant-statistic-content {
+    font-size: 16px;
+  }
+</style>
+
+<script>
+  Vue.component('a-custom-statistic', {
+    props: {
+      'title': {
+        type: String,
+        required: false,
+      },
+      'value': {
+        type: String,
+        required: false
+      }
+    },
+    template: `{{template "component/customStatistic"}}`,
+  });
+</script>
+{{end}}