feat: release v1.0.0 — aggregated search, IEEE source, translation, i18n

Major release: aggregated search (parallel multi-source, DOI dedup, streaming load, load-more preserving scroll), IEEE Xplore API source, search-time title auto-translation via zotero-pdf-translate (caching + concurrent dedup), journal rank filter dialog, filter state preservation across load-more, 403 error handling refinement (successCodes:null, IEEE Mashery header recognition, retry with backoff), full i18n (29 hardcoded Chinese strings replaced with getString, 50+ new Fluent keys in zh-CN and en-US), bilingual README with language switcher.