chore: 移除多余依赖与PostCSS配置

删除@capacitor/share、@capacitor/status-bar、@capawesome/capacitor-file-picker、postcss及相关依赖，移除postcss.config.js，简化依赖树。README下载链接样式调整为纯文本列表，提升可维护性。

package.json

@@ -9,7 +9,7 @@
   },
   "private": true,
   "version": "1.4.0",
-  "buildDate": "2025/12/20 00:39:08",
+  "buildDate": "2025/12/20 04:05:08",
   "main": "dist-electron/main.js",
   "type": "module",
   "scripts": {
@@ -27,9 +27,6 @@
     "@capacitor/cli": "^8.0.0",
     "@capacitor/core": "^8.0.0",
     "@capacitor/filesystem": "^8.0.0",
-    "@capacitor/share": "^8.0.0",
-    "@capacitor/status-bar": "^8.0.0",
-    "@capawesome/capacitor-file-picker": "^8.0.0",
     "@tailwindcss/vite": "^4.1.17",
     "@tanstack/vue-table": "^8.21.3",
     "@vueuse/core": "^14.1.0",
@@ -60,8 +57,6 @@
     "electron": "^39.2.7",
     "electron-builder": "^26.0.12",
     "electron-vite": "^5.0.0",
-    "postcss": "^8.5.6",
-    "postcss-preset-env": "^10.5.0",
     "tailwind-merge": "^3.4.0",
     "tw-animate-css": "^1.4.0",
     "typescript": "~5.9.3",