build: 更新版本号为5.2.1-0以准备 Debian 包发布

同步修改了debian changelog和package相关文件的版本字段，适配 Debian 软件包的版本命名规范，完成初始打包准备工作

debian/changelog

@@ -1,4 +1,4 @@
-spark-store (5.2.1) UNRELEASED; urgency=medium
+spark-store (5.2.1-0) UNRELEASED; urgency=medium
 
   * Initial release. (Closes: #nnnn)  <nnnn is the bug number of your ITP>
 

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "spark-store",
-  "version": "5.2.1",
+  "version": "5.2.1-0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "spark-store",
-      "version": "5.2.1",
+      "version": "5.2.1-0",
       "license": "GPL-3.0",
       "dependencies": {
         "@tailwindcss/vite": "^4.1.18",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "spark-store",
-  "version": "5.2.1",
+  "version": "5.2.1-0",
   "main": "dist-electron/main/index.js",
   "description": "Client for Spark App Store",
   "author": "elysia-best <elysia-best@simplelinux.cn.eu.org>",