Self-hosted metadata reader for Matchcamera

@uswriting/exiftool 1.0.9 and @6over3/zeroperl-ts 1.0.10
Author: 6over3; Apache License 2.0 (LICENSE-Apache-2.0.txt).
Sources: https://github.com/6over3/exiftool
         https://github.com/6over3/zeroperl-ts

The packaged WASM includes Perl 5.42.0 and ExifTool 13.42.
ExifTool copyright 2003-2025 Phil Harvey; same terms as Perl
(Artistic License or GPL). See README-ExifTool.txt and LICENSE-Perl-*.
Sources: https://github.com/exiftool/exiftool/tree/13.42
         https://github.com/Perl/perl5/tree/v5.42.0
The zeroperl runtime glue is copyright (c) 2025 United States Writing
Corportation, MIT License (original spelling retained).
Source: https://github.com/6over3/zeroperl
The runtime also links zlib 1.3.1 and bzip2 1.0.8. Their copyright and
license notices are preserved in LICENSE-zlib.txt and LICENSE-bzip2.txt.

Matchcamera modifications to the JavaScript distribution:
- exiftool.js imports the pinned local zeroperl.js, without a package CDN.
- zeroperl.js resolves zeroperl.wasm relative to its own module URL.
- zeroperl.js recognizes Web Workers as browser contexts.
The WASM bytes are copied unchanged from the pinned npm package.
Rebuild instructions: scripts/build_shutter_vendor.mjs in the source repository.

Only this local WASM asset is fetched by the reader. Selected photos are
read through the File API and never uploaded by the metadata reader.
Do not call parseMetadata concurrently: upstream shares runtime/output state.