cshum / imagor / 20613562574

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fix: reject percent-encoded filenames in HTTPLoader (#691)

This fixes issue #627 where filenames containing percent-encoded
characters (like "https%3A%2F%2Fexample.com.avif", often from b64-decoded
content) were incorrectly interpreted as URLs by having the default
scheme prepended to them.

The fix adds a check in parseAndValidateURL to detect strings containing
valid percent-encoded characters (e.g., %3A, %2F). When such strings are
found and they lack a scheme/host, they are now rejected with ErrInvalid
instead of having a default scheme prepended. This allows other loaders
(like FileStorage) to handle them as literal filenames.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Signed-off-by: majiayu000 <1835304752@qq.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

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