feat: add support for automatic label color calculation for post tags (halo-dev/console#721)

#### What type of PR is this?

/kind feature
/milestone 2.0.0-rc.2

#### What this PR does / why we need it:

添加自动计算文章标签文字颜色的支持。在之前的版本中，因为引入 colorjs.io 导致在构建之后无法显示标签，目前 colorjs.io 已经修复此问题，此 PR 回归之前的支持。

- https://github.com/LeaVerou/color.js/releases/tag/v0.4.2
- https://github.com/LeaVerou/color.js/pull/239

#### Special notes for your reviewer:

测试方式：

1. 创建若干文章标签，设置不同的背景色，观察文字颜色是否会自动与背景颜色形成反差。
2. 使用 `pnpm build` 构建生产版本，在 Halo 的配置文件中配置 `halo.console.location` 到 Console 的 `dist` 目录。
3. 检查 Console 文章列表中的标签是否显示正常。

#### Does this PR introduce a user-facing change?


```release-note
Console 端添加自动计算文章标签文字颜色的支持。
```

src/modules/contents/posts/tags/components/PostTag.vue

@@ -3,6 +3,7 @@ import { VTag } from "@halo-dev/components";
 import type { Tag } from "@halo-dev/api-client";
 import { computed } from "vue";
 import { useRouter } from "vue-router";
+import Color from "colorjs.io";
 
 const props = withDefaults(
   defineProps<{
@@ -19,8 +20,9 @@ const labelColor = computed(() => {
   if (!color) {
     return "inherit";
   }
-  // TODO computed label color
+  const onWhite = Math.abs(Color.contrast(color, "white", "APCA"));
-  return "#333";
+  const onBlack = Math.abs(Color.contrast(color, "black", "APCA"));
+  return onWhite > onBlack ? "white" : "#333";
 });
 
 const router = useRouter();
@@ -40,7 +42,6 @@ const handleRouteToDetail = () => {
     :styles="{
       background: tag.spec.color,
       color: labelColor,
-      borderColor: tag.spec.color,
     }"
     @click="handleRouteToDetail"
   >

src/modules/contents/posts/tags/components/TagEditingModal.vue

@@ -43,7 +43,7 @@ const initialFormState: Tag = {
   spec: {
     displayName: "",
     slug: "",
-    color: "#b16cBe",
+    color: "#ffffff",
     cover: "",
   },
   apiVersion: "content.halo.run/v1alpha1",

src/views/system/setup-data/tag.json

@@ -2,7 +2,7 @@
   "spec": {
     "displayName": "Halo",
     "slug": "halo",
-    "color": "#ad95b2",
+    "color": "#ffffff",
     "cover": ""
   },
   "apiVersion": "content.halo.run/v1alpha1",