Warn on wildcard remote directories

[huangzesen]

Summary

• warn when remote_path contains wildcard characters before URL expansion
• warn when remote_file directory components contain wildcard characters
• keep existing behavior unchanged: the warning is informational and downloads still proceed

Fixes #142

Validation

• static check: warning block appears before url = remote_path + remote_file and before spd_download_expand
• no IDL runtime was available here, so this was not runtime-reproduced locally

Review

• Zhipu/GLM review gate: reviewed before PR; remote_path coverage added after review; no blocking findings