feat: 实现命令面板、颜色取色、JSON格式化和系统信息功能

- 重构项目架构,采用四层架构模式 (Command → Service → Platform → Utils)
  - 实现命令面板功能,支持快捷搜索和特征分类
  - 添加颜色取色功能,支持屏幕像素颜色获取
  - 添加JSON格式化功能,支持JSON格式化和压缩
  - 添加系统信息功能,显示操作系统和硬件信息
  - 移除旧的状态文档和无用配置文件

src-tauri/capabilities/default.json

@@ -2,9 +2,14 @@
   "$schema": "../gen/schemas/desktop-schema.json",
   "identifier": "default",
   "description": "Capability for the main window",
-  "windows": ["main"],
+  "windows": ["main", "picker_overlay"],
   "permissions": [
     "core:default",
+    "core:window:allow-hide",
+    "core:window:allow-show",
+    "core:window:allow-close",
+    "core:window:allow-set-focus",
+    "core:window:allow-is-visible",
     "opener:default"
   ]
 }