build(tauri): productName 改英文 + 版本号 0.4.0→0.12.1

- 修复 light.exe 打包失败（LGHT0311：中文 productName「熵减」无法用 WiX cp1252 码页编码）
- 版本号与 CHANGELOG/v0.12.1 交付对齐（tauri.conf/Cargo/pkg 三处同步）

Author: Aparencia

app/package-lock.json

@@ -1,7 +1,7 @@
-{
+{
   "name": "app",
   "private": true,
-  "version": "0.4.0",
+  "version": "0.12.1",
   "type": "module",
   "scripts": {
     "dev": "vite",

app/package.json

@@ -1,6 +1,6 @@
 [package]
 name = "entropydecrease"
-version = "0.4.0"
+version = "0.12.1"
 description = "熵减 - 视频知识提取与持久化（本地优先）"
 authors = ["Aparencia"]
 edition = "2021"

app/src-tauri/Cargo.lock

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
-  "productName": "熵减",
-  "version": "0.4.0",
+  "productName": "Entropydecrease",
+  "version": "0.12.1",
   "identifier": "com.entropydecrease.app",
   "build": {
     "beforeDevCommand": "npm run dev",