chore: init v2 project scaffold

- Add electron-vite + Vue 3 + TypeScript build config
- Add .gitignore with legacy/ exclusion
- Add AGENTS.md with architecture & dev commands
- Update README.md

AGENTS.md

@@ -0,0 +1,63 @@
+# AGENTS.md — JRedisDesktop v2
+
+## Project identity
+
+Fork of [AnotherRedisDesktopManager](https://github.com/qishibo/AnotherRedisDesktopManager). The legacy Vue 2 codebase lives in `legacy/` and is gitignored. Work only in the root project.
+
+## Stack
+
+- **Shell:** Electron 33 (`src/main/index.ts`)
+- **Preload:** `src/preload/index.ts`
+- **Renderer:** Vue 3 + Element Plus + Vue Router (`src/renderer/`)
+- **Build:** electron-vite + Vite 6 + TypeScript 5
+- **Redis client:** ioredis 5
+
+## Commands
+
+```bash
+npm run dev            # electron-vite dev (HMR, renderer on :5173)
+npm run build          # production build → out/
+npm start              # preview built app
+npm run build:unpack   # build + electron-builder --dir
+npm run build:win      # build + electron-builder --win
+npm run build:mac      # build + electron-builder --mac
+npm run build:linux    # build + electron-builder --linux
+```
+
+## Architecture
+
+```
+Electron main (src/main/index.ts)
+  ├── Dev:  loads renderer dev server (Vite HMR)
+  └── Prod: loads out/renderer/index.html
+        └── Vue 3 SPA (src/renderer/)
+              @renderer alias → src/renderer/src/
+```
+
+## Build config
+
+- `electron.vite.config.ts` defines three build targets: main, preload, renderer
+- Renderer dev server runs on port 5173
+- Main/preload use `externalizeDepsPlugin()` to keep node_modules external
+
+## TypeScript
+
+- Root `tsconfig.json` references `tsconfig.node.json` (main + preload) and `tsconfig.web.json` (renderer)
+- Node target includes `src/main/**/*`, `src/preload/**/*`, `electron.vite.config.ts`
+- Web target includes `src/renderer/**/*`
+- `@renderer` alias resolves to `src/renderer/src`
+
+## Source layout (expected)
+
+```
+src/
+├── main/        # Electron main process
+├── preload/     # Preload scripts
+└── renderer/    # Vue 3 app
+    ├── index.html
+    └── src/
+```
+
+## Legacy
+
+The `legacy/` directory contains the old Vue 2 + Webpack 4 codebase. It is gitignored and not part of the v2 build. See `legacy/AGENTS.md` for its documentation.