feat(stream): enhance GetRangeReaderFromLink rate limiting

[j2rong4cn]

Description / 描述

url并发下载支持速率限制

Motivation and Context / 背景

How Has This Been Tested? / 测试

Checklist / 检查清单

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  • OpenList-Frontend #XXXX
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[Copilot]

Pull Request Overview

This PR refactors the rate limiting logic for range readers and consolidates duplicate code. The main focus is on cleaning up how RateLimitReader is applied and removing redundant wrapper types.

• Simplified rate limiting logic by applying RateLimitReader directly in GetRangeReaderFromLink instead of wrapping with RateLimitRangeReaderFunc
• Removed the need for FileRangeReader wrapper in driver-level Link implementations where the underlying reader doesn't actually support file operations
• Improved context error checking by replacing the custom utils.IsCanceled check with direct Ctx.Err() calls

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
internal/stream/util.go	Restructured GetRangeReaderFromLink to apply rate limiting at HTTP client level for both URL and RangeReader paths; changed return type of GetRangeReaderFromMFile to *model.FileRangeReader
internal/stream/limit.go	Simplified context cancellation checks by using Ctx.Err() directly; optimized RateLimitRangeReaderFunc to check for nil limiter before executing
internal/net/util.go	Replaced custom LimitedReadCloser implementation with readers.NewLimitedReadCloser from rclone library
internal/model/file.go	Added documentation comment explaining the purpose of FileRangeReader wrapper
internal/model/args.go	Changed ContentLength field JSON tag from "-" to "content_length" to enable serialization
drivers/proton_drive/driver.go	Removed unnecessary FileRangeReader wrapper as the underlying reader doesn't support file operations
drivers/ftp/driver.go	Removed unnecessary FileRangeReader wrapper as the underlying reader doesn't support file operations

Comments suppressed due to low confidence (1)

internal/stream/util.go:113

• Corrected spelling of 'perfromace' to 'performance'.

			log.Warnf("remote http server not supporting range request, expect low perfromace!")

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