fix: 更新安装程序中的仓库分支引用和版本显示

将GitHub仓库的默认分支从'primary'更新为'main'以匹配实际分支名称
移除安装程序标题中的版本号'1.0'以简化显示

installer.lua

@@ -59,7 +59,7 @@ end
 print("Run installer step 9")
 term.at(1,1).clear()
 tu.coloredPrint(colors.yellow,
-  "LeonOS Installer 1.0\n=======================")
+  "LeonOS Installer\n=======================")
 
 local ROM_DIR
 tu.coloredPrint("Enter installation directory ", colors.yellow, "[",
@@ -87,7 +87,7 @@ end
 
 bullet("Getting repository tree...")
 
-local repodata = dl("https://api.github.com/repos/Leonmmcoset/LeonOS/git/trees/primary?recursive=1")
+local repodata = dl("https://api.github.com/repos/Leonmmcoset/LeonOS/git/trees/main?recursive=1")
 
 repodata = json.decode(repodata)