feat(theme): 新增主题可配置项，优化代码逻辑和样式

-  在 `komari-theme.json` 中添加了新的配置选项
- 支持自定义标题栏、内容区、实例页面和通用UI元素
- 优化部分组件调用逻辑
- 优化页面样式

src/components/sections/NodeCard.tsx

@@ -6,25 +6,12 @@ import { CpuIcon, MemoryStickIcon, HardDriveIcon } from "lucide-react";
 import Flag from "./Flag";
 import { Tag } from "../ui/tag";
 import { useNodeCommons } from "@/hooks/useNodeCommons";
+import { ProgressBar } from "../ui/progress-bar";
 
 interface NodeCardProps {
   node: NodeWithStatus;
 }
 
-const ProgressBar = ({
-  value,
-  className,
-}: {
-  value: number;
-  className?: string;
-}) => (
-  <div className="w-full bg-gray-200 rounded-full h-3 dark:bg-gray-700">
-    <div
-      className={`h-3 rounded-full ${className}`}
-      style={{ width: `${value}%` }}></div>
-  </div>
-);
-
 export const NodeCard = ({ node }: NodeCardProps) => {
   const {
     stats,