Summary

Adds a pure-Go alternative to jsluice using dop251/goja parser, enabling CGO-free cross-platform builds.

Fixes #1367

What changed?

• Added nocgo build tag for CGO-free builds
• New jsluice_stub.go with goja-based JS endpoint extraction
• Updated parser_nojs.go to handle -jsluice flag (was silently ignored before)
• Works identically to jsluice but without tree-sitter/CGO dependency

Usage

# Cross-compile to macOS ARM64 (no CGO needed)
GOOS=darwin GOARCH=arm64 CGO_ENABLED=0 go build -tags nocgo ./cmd/katana

Testing

• CGO build works
• nocgo build works
• Cross-compile darwin/arm64 ✓
• Cross-compile windows/amd64 ✓
• All unit tests pass

/claim #1367

Summary by CodeRabbit

• New Features

  • Added JavaScript endpoint extraction to detect URLs and API endpoints inside JS assets, including a CGO-free extractor and tests.

• Chores

  • Added optional support for scraping jsluice-style JS responses.
  • Added build variants to better support CGO-free targets.
  • Updated module dependencies for JS parsing support.