feat: 新增 BiliNote AI笔记系统一对一搭建服务二维码（README + 关于页），bump 版本至 2.3.4

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

BillNote_frontend/src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "../node_modules/@tauri-apps/cli/config.schema.json",
   "productName": "BiliNote",
-  "version": "2.3.3",
+  "version": "2.3.4",
   "identifier": "com.jefferyhuang.bilinote",
   "build": {
     "frontendDist": "../dist",