refactor: 迁移至 electron-vite 官方推荐目录结构

- electron/* -> src/main/* (主进程)
- electron/preload.ts -> src/preload/index.ts (预加载)
- src/electron-api.d.ts -> src/preload/index.d.ts (类型声明)
- src/* -> src/renderer/src/* (渲染进程)
- src/index.html -> src/renderer/index.html
- electron.vite.config.ts 简化为自动入口检测 (零配置)
- tsconfig.app.json -> tsconfig.web.json, 更新 includes/paths
- 构建产物 dist-electron/ -> out/ (修复 main/preload 输出覆盖 bug)
- 更新 package.json main 字段 + electron-builder files
- 更新 .gitignore + eslint ignores
- 更新 AGENTS.md 架构文档

package.json

@@ -9,7 +9,7 @@
   },
   "homepage": "http://git.jokul.space/Jokul/JRedisDesktop",
   "type": "module",
-  "main": "./dist-electron/main.js",
+  "main": "./out/main/index.js",
   "allowScripts": {
     "electron": true,
     "esbuild": true,
@@ -60,10 +60,9 @@
       "output": "release"
     },
     "files": [
-      "dist/**/*",
-      "dist-electron/**/*",
+      "out/**/*",
       "!**/*.map",
-      "!dist-electron/**/*.map",
+      "!out/**/*.map",
       "package.json"
     ],
     "publish": {