优化输入框校验

[CiiLu]

• 确认后 reject 改为使用 validator
• 外置登录服务器、网络下载整合包添加 URL 校验

[Copilot]

Pull request overview

This PR refactors input field validation across the application by replacing imperative validation in reject callbacks with declarative validator objects. The changes improve user experience by providing immediate feedback on invalid input rather than waiting for submission.

Key Changes:

• Introduced validator-based validation for input dialogs using the existing Validator and URLValidator classes
• Replaced manual validation checks in callbacks with upfront validators that disable submission buttons when input is invalid
• Added URL validation for external login servers and modpack download URLs

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
InputDialogPane.java	Added constructor overload that accepts validators, implements real-time validation with button state management
Controllers.java	Updated prompt() method signature to accept varargs validators while maintaining backward compatibility; reorganized imports
WorldListPage.java	Added file name validator to world import dialog to prevent invalid filenames upfront
Versions.java	Refactored version rename and duplicate operations to use validators instead of manual validation in callbacks; reorganized imports for clarity
DownloadPage.java	Added file name validator to download dialog; removed manual validation check from callback
ModpackSelectionPage.java	Added URL validator to remote modpack selection to ensure valid URLs before download attempts
AddAuthlibInjectorServerPane.java	Replaced button disable binding with URL validator and real-time validation; ensures valid URLs before server lookup

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