Add typed JSON output to app logs sources

[gonzaloriestra]

WHY are these changes introduced?

Related to https://github.com/shop/issues-develop/issues/23670.

app logs sources has no machine-readable output or discoverable result schema.

WHAT is this pull request doing?

Add --json with typed source records containing the filter string, extension identity, configuration, paths and capabilities already available locally. Record the field inventory and exclusions beside the schema. Keep namespace sections in text output and preserve invalid-app exit behavior.

Expose the schema in help and refresh generated documentation. Each record's source is the value accepted by app logs --source.

Validation: 15 focused tests cover source metadata, filtering/order, schema validation, text output, real stdout/stderr, empty results and exit status. App type checking, focused lint, Knip, CLI build and generated help/docs checks pass.

How to manually test your changes?

pnpm shopify app logs sources --path /path/to/app
pnpm shopify app logs sources --path /path/to/app --json
pnpm shopify app logs sources --json-schema

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact