Extracts the JSON-LD JobPosting lookup into a recursive parseJobPostingJsonLd helper that handles top-level objects, arrays, and @graph wrappers (including nested combinations), keeps skipping malformed scripts, and covers all four cases with network-free Bun tests.
By @luochen211. Closes#189.
Jobbank and Jobdanmark each had only one narrow test, leaving required-argument errors, RSS normalization, JSON-LD variants, and malformed-page handling unprotected.
Add network-free fixture and subprocess tests for repeated RSS filters, description and ID parsing, stderr JSON errors, Bunli numeric validation, JSON-LD objects and arrays, optional fields, not-found pages, and parse failures.
The suites now cover eight Jobbank cases and six Jobdanmark cases without making live portal requests.
落尘