object/sftp: fix endpoint parsing for path colons

[zhijian-pro]

No description provided.

[zhijian-pro]

格式	修复前	修复后
host:/path	✅ 默认端口 22，路径 /path	✅ 保持不变
host:relative/path	✅ 默认端口 22，相对路径	✅ 保持不变
host:2022:/path	✅ 端口 2022，路径 /path	✅ 保持不变
host:2022:relative/path	✅ 端口 2022，相对路径	✅ 保持不变
host:2022/path	⚠️ 不报错，但按端口 22、路径 2022/path 解析	❌ 报缺少端口与路径之间的冒号
host:/path/T05:53:21	❌ too many colons in address	✅ 端口 22，时间戳完整保留
host:2022:/path/T05:53:21	❌ too many colons in address	✅ 端口 2022，时间戳完整保留
host:2022/path/T05:53:21	❌ too many colons in address	❌ 明确报 missing colon between port and path
[2001:db8::1]:/path	✅ IPv6，默认端口 22	✅ 保持不变
[2001:db8::1]:2022:/path	✅ IPv6，端口 2022	✅ 保持不变
[2001:db8::1]:2022/path	⚠️ 不报错，但按端口 22、路径 2022/path 解析	❌ 明确报缺少冒号
[2001:db8::1]:/path/T05:53:21	❌ 路径冒号导致解析失败	✅ 默认端口 22，时间戳完整保留
[2001:db8::1]:2022:/path/T05:53:21	❌ 路径冒号导致解析失败	✅ 端口 2022，时间戳完整保留
[2001:db8::1]:2022/path/T05:53:21	❌ 路径冒号导致解析失败	❌ 明确报 missing colon between port and path
host:/path/T05%3A53%3A21	✅ %3A 作为远端文件名的字面量	✅ 保持不变，仍不会解码成冒号

[Copilot]

Pull request overview

Improves SFTP endpoint parsing for custom ports, IPv6 hosts, and timestamped paths.

Changes:

• Extracts endpoint parsing into a dedicated helper.
• Adds table-driven parser tests.
• Documents supported SFTP formats in English and Chinese.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
pkg/object/sftp.go	Implements endpoint parsing.
pkg/object/object_storage_test.go	Tests endpoint formats and errors.
docs/en/guide/sync.md	Documents SFTP syntax.
docs/zh_cn/guide/sync.md	Adds corresponding Chinese documentation.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.94%. Comparing base (a617e1b) to head (618f71c).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/object/sftp.go	0.00%	42 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7406      +/-   ##
==========================================
+ Coverage   34.44%   40.94%   +6.49%     
==========================================
  Files         140      178      +38     
  Lines       48323    58902   +10579     
==========================================
+ Hits        16645    24115    +7470     
- Misses      29995    31851    +1856     
- Partials     1683     2936    +1253     

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