PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ng-alain/delon/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[x ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

The current URL handling does not correctly concatenate query parameters if the URL already contains existing parameters.
exp:

in app.config.ts:
"lodop": {
    "companyName": "xxxxxx",
    "url": "https://print.xxx.com:8443/CLodopfuncs.js?AOListCount=500"
}

lodop.service.ts#request:
https://print.xxx.com:8443/CLodopfuncs.js?AOListCount=100?name=CLodop

What is the new behavior?

The URL handling has been refactored to correctly concatenate query parameters even if the URL already contains existing parameters. The new implementation also ensures proper encoding of the query parameters.
exp:
https://print.xxx.com:8443/CLodopfuncs.js?AOListCount=100&name=CLodop

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information