fix(obs): 修复选择华为obs作为对象存储并配置proxyDomain参数时校验出错的bug

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fix: 修复选择华为obs作为对象存储并配置proxyDomain参数时校验出错的bug

Description

当前 OBS 配置代理域名时，上传和复制文件返回的是代理 URL，导致物理路径无法稳定识别为 OBS provider，进而影响资源注册、后续读取及多存储后端路由。该提交统一将 OBS 内部路径规范化为 obs://{bucket}/{objectKey}，代理域名仅用于生成访问 URL，修复 OBS 文件上传路径错误。

同时，提交兼容历史代理 URL 和裸对象路径，补充了上传、路径解析、文件复制、跨后端拷贝校验及资源目录注册测试，能够降低存量数据迁移风险并避免类似路径混淆问题。因此该修复具备明确的线上问题价值和完整的回归保障，建议合入主分支。

Type of Change

• 🐛 Bug fix
• ✨ New feature
• 💥 Breaking change
• 📚 Documentation update
• 🎨 Refactor
• ⚡ Performance improvement
• 🧪 Test
• 🔧 Configuration / Build / CI

Related Issue

Fixes #

Testing

Checklist

• git diff --check origin/main...HEAD passes
• Changed source files are formatted
• Targeted tests for the changed packages/components pass
• Diff-scoped lint passes where applicable (for Go: golangci-lint run --new-from-rev=origin/main ./...)
• Full-repository checks were run, or any unrelated/environment-dependent failures are documented above
• Self-reviewed the code
• Added/updated tests covering the change
• Updated related documentation (README, docs/, Swagger annotations, etc.)
• Breaking changes are clearly called out in the description above

Screenshots / Recordings