Port the KiCad symbol/footprint brace-scanner parsers + a combined extractor
into web/backend/src/extract/; ensure-example-libs blobless/sparse-clones a
curated KiCad 10.0.3 slice and extracts to a gitignored .libs/ on dev/start, so
a bare GPL clone has libraries with no closed repo present. libsConfig() defaults
LIBS_DIR to ./.libs. vite honors STANDALONE_PORT (strictPort) so a second editor
can run on :3049 alongside the closed stack.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>