feat(主题): 添加主题编辑器功能并更新相关UI

- 新增主题编辑器组件和上下文管理
- 实现主题的保存、删除和自定义功能
- 更新主题相关API接口
- 调整主题样式透明度
- 替换应用logo为高清版本
- 更新README和package.json描述信息

package.json

@@ -1,10 +1,10 @@
 {
   "name": "secscore",
   "version": "1.0.0",
-  "description": "An Electron application with React and TypeScript",
+  "description": "SecScore – Your Education Points Management Expert",
   "main": "./out/main/index.js",
   "author": "example.com",
-  "homepage": "https://electron-vite.org",
+  "homepage": "https://example.org",
   "scripts": {
     "format": "prettier --write .",
     "lint": "eslint --cache .",
@@ -35,7 +35,8 @@
     "uuid": "^13.0.0",
     "winston": "^3.19.0",
     "winston-daily-rotate-file": "^5.0.0",
-    "xlsx": "^0.18.5"
+    "xlsx": "^0.18.5",
+    "pnpm": "^8.1.2"
   },
   "devDependencies": {
     "@electron-toolkit/eslint-config-prettier": "^3.0.0",