refactor(download): 重构下载任务逻辑，添加对多源下载的支持

[Dainsleif233]

Checklist

• Changes have been tested locally and work as expected.
• All tests in workflows pass successfully.
• Documentation has been updated if necessary.
• Code formatting and commit messages align with the project's conventions.
• Comments have been added for any complex logic or functionality if possible.

This PR is a ..

• 🛠 Refactoring

Related Issues

• close [Feature] 下载任务新增 fallback src #1025

Description

• 下载改成传入URL数组，响应错或哈希验证错误时依次尝试。
• 安装Modrinth格式整合包时会将文件downloads全部传入。

[UNIkeEN]

related issue可以加一些关键词，以在合并 PR 后自动关闭 issue~
（比如 close #1025 ，这样写就自动 link 上了，github 对关键词列表有文档的但我找不到了喵）

本条 PR 将在本周末（如届时已经 ready for review）由后端同学 review

[Dainsleif233]

就先这样吧，本来想加多线程

[ToolmanP]

有哪个场景需要这样子的重构？

[Dainsleif233]

有哪个场景需要这样子的重构？

安装modrinth整合包时

SJMCL/src-tauri/src/instance/helpers/modpack/modrinth.rs

Lines 110 to 114 in d7a9d10

	.map(|file| {
	let download_url = file
	.downloads
	.first()
	.ok_or(InstanceError::InvalidSourcePath)?;

[Copilot]

Pull request overview

This PR refactors the download task system to support multiple source URLs with automatic fallback. When a download fails due to network errors or SHA1 hash validation failures, the system will automatically retry using alternative mirror URLs. The key change is converting the src field from a single URL to an array of URLs throughout both the TypeScript frontend and Rust backend.

Key Changes

• Modified DownloadParam and DownloadTaskPayload to use URL arrays instead of single URLs in both frontend (src/models/task.ts) and backend (src-tauri/src/tasks/download.rs)
• Implemented retry loop logic in the download task that attempts each source URL sequentially on failure, with automatic cleanup and state reset between attempts
• Updated Modrinth modpack installation to pass all available download mirrors from the manifest to leverage multi-source support

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/models/task.ts	Changed src field from string to string[] in download task type definitions
src/pages/settings/dev-test.tsx	Updated test page to wrap download URL in array
src/components/modals/download-specific-resource-modal.tsx	Wrapped single download URL in array for resource downloads
src-tauri/src/tasks/download.rs	Core refactoring: changed src to Vec<Url>, implemented multi-source retry loop with error handling and state cleanup
src-tauri/src/tasks/streams/mod.rs	Removed automatic completion marking from stream end (now handled explicitly after SHA1 validation)
src-tauri/src/instance/helpers/modpack/modrinth.rs	Updated to pass all available download URLs from Modrinth manifest for each file
src-tauri/src/instance/helpers/modpack/curseforge.rs	Wrapped CurseForge download URL in array
src-tauri/src/instance/helpers/loader/*.rs	Wrapped loader installer and library URLs in arrays across forge, neoforge, and fabric loaders
src-tauri/src/launch/helpers/file_validator.rs	Wrapped library and asset download URLs in arrays
src-tauri/src/resource/commands.rs	Wrapped resource download URLs in arrays
src-tauri/src/resource/helpers/modrinth/mod.rs	Wrapped Fabric API mod download URL in array
src-tauri/src/launcher_config/helpers/java.rs	Wrapped Java runtime download URLs in arrays
src-tauri/src/launcher_config/helpers/updater.rs	Wrapped launcher update download URL in array
src-tauri/src/instance/commands.rs	Wrapped client jar download URL in array