fix: ZIP files always use forward slashes / regardless of the operati…

[fatelei]

…ng system

Description

fix langgenius/dify#32650

Root Cause: In pkg/bundle_packager/memory_zip.go, the code used filepath.Separator (which is \ on Windows) to check for the _assets/ directory prefix in ZIP file paths. ZIP files always use forward slashes / regardless of the operating system, causing the asset detection to fail on Windows.

Type of Change

• Bug fix
• New feature
• Refactor
• Performance improvement
• Other

Essential Checklist

Testing

• I have tested the changes locally and confirmed they work as expected
• I have added unit tests where necessary and they pass successfully

Bug Fix (if applicable)

• I have used GitHub syntax to close the related issue (e.g., Fixes #123 or Closes #123)

Additional Information

Please provide any additional context that would help reviewers understand the changes.

[gemini-code-assist]

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