Make login page use custom favicon (#3484)

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#### What type of PR is this?
/kind improvement
/area console
/area core
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/kind deprecation
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/kind regression
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#### What this PR does / why we need it:
console 端登陆页使用自定义favicon
#### Which issue(s) this PR fixes:

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Fixes https://github.com/halo-dev/halo/issues/3285

#### Special notes for your reviewer:
在`/actuator/globalinfo`暴露favicon信息，异步获取favicon信息，未获取到数据时浏览器短暂使用默认的`/console/favicon.ico`。
#### Does this PR introduce a user-facing change?

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```release-note
console 端登陆页使用自定义favicon
```

console/src/App.vue

@@ -1,10 +1,11 @@
 <script lang="ts" setup>
 import { RouterView, useRoute } from "vue-router";
-import { computed, watch } from "vue";
+import { computed, watch, ref } from "vue";
 import { useTitle } from "@vueuse/core";
 import { useFavicon } from "@vueuse/core";
 import { useSystemConfigMapStore } from "./stores/system-configmap";
 import { storeToRefs } from "pinia";
+import axios from "axios";
 
 const { configMap } = storeToRefs(useSystemConfigMapStore());
 
@@ -26,16 +27,31 @@ watch(
 
 // Favicon
 const defaultFavicon = "/console/favicon.ico";
+const globalInfoFavicon = ref("");
+
+(async () => {
+  const { data } = await axios.get(
+    `${import.meta.env.VITE_API_URL}/actuator/globalinfo`,
+    {
+      withCredentials: true,
+    }
+  );
+  if (data?.favicon) {
+    globalInfoFavicon.value = data.favicon;
+  }
+})();
 
 const favicon = computed(() => {
-  if (!configMap?.value?.data?.["basic"]) {
-    return defaultFavicon;
+  if (configMap?.value?.data?.["basic"]) {
+    const basic = JSON.parse(configMap.value.data["basic"]);
+
+    if (basic.favicon) {
+      return basic.favicon;
+    }
   }
 
-  const basic = JSON.parse(configMap.value.data["basic"]);
-
-  if (basic.favicon) {
-    return basic.favicon;
+  if (globalInfoFavicon.value) {
+    return globalInfoFavicon.value;
   }
 
   return defaultFavicon;

src/main/java/run/halo/app/actuator/GlobalInfoEndpoint.java

@@ -12,6 +12,7 @@ import run.halo.app.extension.ConfigMap;
 import run.halo.app.infra.ExternalUrlSupplier;
 import run.halo.app.infra.SystemConfigurableEnvironmentFetcher;
 import run.halo.app.infra.SystemSetting;
+import run.halo.app.infra.SystemSetting.Basic;
 import run.halo.app.infra.SystemSetting.Comment;
 import run.halo.app.infra.SystemSetting.User;
 
@@ -40,6 +41,7 @@ public class GlobalInfoEndpoint {
             .ifPresent(configMap -> {
                 handleCommentSetting(info, configMap);
                 handleUserSetting(info, configMap);
+                handleBasicSetting(info, configMap);
             }));
 
         return info;
@@ -60,6 +62,8 @@ public class GlobalInfoEndpoint {
 
         private boolean allowRegistration;
 
+        private String favicon;
+
     }
 
     private void handleCommentSetting(GlobalInfo info, ConfigMap configMap) {
@@ -84,4 +88,11 @@ public class GlobalInfoEndpoint {
         }
     }
 
+    private void handleBasicSetting(GlobalInfo info, ConfigMap configMap) {
+        var basic = SystemSetting.get(configMap, Basic.GROUP, Basic.class);
+        if (basic != null) {
+            info.setFavicon(basic.getFavicon());
+        }
+    }
+
 }