fix: drop file fail on windows

[SodaACE]

Types

• [ ] 🎉 New Features
• [x] 🐛 Bug Fixes
• [ ] 📚 Documentation Changes
• [ ] 💄 Code Style Changes
• [ ] 💄 Style Changes
• [ ] 🪚 Refactors
• [ ] 🚀 Performance Improvements
• [ ] 🏗️ Build System
• [ ] ⏱ Tests
• [ ] 🧹 Chores
• [ ] Other Changes

Background or solution

fix https://github.com/opensumi/core/issues/3615 在 $ensureFileExis方法里的targetPath原来类似于图片上这种，在创建文件写入流会报错，报错原因是路径生成错误。

Changelog

修复在windows上，拖拽文件到IDE中，文件损坏的问题

Summary by CodeRabbit

• Bug Fixes
  • 修复文件拖放时的目标路径解析问题，解决在 Windows 等平台因路径格式不兼容导致无法创建/写入文件的情况，提升稳定性与跨平台兼容性。

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Walkthrough

在 FileDropService 中，将两个内部目标路径的计算从 Uri.file(...).path 切换为 Uri.file(...).fsPath，其余写入流创建、写入与关闭逻辑未改动；无公开 API 变更。

Changes

Cohort / File(s)	Summary
文件拖拽服务路径计算更新 packages/addons/src/node/file-drop.service.ts	在 $ensureFileExist 与 $writeStream 中，将目标路径从 .path 改为 .fsPath，用于生成本地文件系统路径；其余逻辑（创建/缓存 WriteStream、按 'binary' 写入、完成时关闭与移除）保持不变。

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Assessment against linked issues

Objective	Addressed	Explanation
修复从操作系统文件管理器拖拽到文件树后文件内容丢失的问题（#3615）	❓	仅更换为 fsPath 涉及路径规范化，疑似面向 Windows，但缺少验证与测试覆盖，无法确认是否完全解决所有场景。

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 52.61%. Comparing base (7dfa870) to head (8a11e83).

Files with missing lines	Patch %	Lines
packages/addons/src/node/file-drop.service.ts	0.00%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4624      +/-   ##
==========================================
+ Coverage   52.59%   52.61%   +0.01%     
==========================================
  Files        1686     1686              
  Lines      104362   104362              
  Branches    22682    22682              
==========================================
+ Hits        54894    54905      +11     
+ Misses      41097    41087      -10     
+ Partials     8371     8370       -1     

Flag	Coverage Δ
jsdom	48.14% <0.00%> (+<0.01%)	:arrow_up:
node	12.03% <0.00%> (+<0.01%)	:arrow_up:

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