feat: 重构前端架构并添加主题支持

删除旧的示例代码和资源文件
添加新的主题样式和全局CSS配置
更新Tauri窗口配置和权限
引入SolidJS路由并优化入口文件

src-tauri/capabilities/default.json

@@ -2,9 +2,12 @@
   "$schema": "../gen/schemas/desktop-schema.json",
   "identifier": "default",
   "description": "Capability for the main window",
-  "windows": ["main"],
+  "windows": [
+    "main"
+  ],
   "permissions": [
     "core:default",
-    "opener:default"
+    "opener:default",
+    "core:window:allow-start-dragging"
   ]
-}
+}