chore: rebrand to FLVX and fix docker multi-arch build

vite-frontend/index.html

@@ -4,7 +4,7 @@
     <meta charset="UTF-8" />
     <link rel="icon" type="image/svg+xml" href="/vite.svg" />
     
-    <title>flux-panel</title>
+    <title>FLVX</title>
     <script>
       // 防止暗黑模式闪烁：在页面加载前立即应用系统主题
       (function() {
@@ -137,13 +137,13 @@
         }
       }
     </style>
-    <meta key="title" content="flux-panel" property="og:title" />
+    <meta key="title" content="FLVX" property="og:title" />
     <meta
-      content="flux-panel"
+      content="FLVX"
       property="og:description"
     />
     <meta
-      content="flux-panel"
+      content="FLVX"
       name="description"
     />
     <meta