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

electron.vite.config.ts

@@ -5,44 +5,19 @@ import { resolve } from 'path'
 export default defineConfig({
   main: {
     plugins: [externalizeDepsPlugin()],
-    build: {
-      outDir: 'dist-electron',
-      rollupOptions: {
-        input: {
-          index: resolve(__dirname, 'electron/main.ts')
-        }
-      }
-    }
   },
   preload: {
     plugins: [externalizeDepsPlugin()],
-    build: {
-      outDir: 'dist-electron',
-      rollupOptions: {
-        input: {
-          index: resolve(__dirname, 'electron/preload.ts')
-        }
-      }
-    }
   },
   renderer: {
-    root: 'src',
-    build: {
-      outDir: resolve(__dirname, 'dist-electron/renderer'),
-      rollupOptions: {
-        input: {
-          index: resolve(__dirname, 'src/index.html')
-        }
-      }
-    },
     resolve: {
       alias: {
-        '@renderer': resolve(__dirname, 'src')
-      }
+        '@renderer': resolve(__dirname, 'src/renderer/src'),
+      },
     },
     plugins: [vue()],
     server: {
-      port: 5173
-    }
-  }
+      port: 5173,
+    },
+  },
 })