release: prepare v3.3.1

[Visterainer]

What changed

• bump AIdea from 3.3.0 to 3.3.1
• update the bilingual release notes for the Zotero item-resolution reliability fix and dependency maintenance
• keep README and user documentation unchanged because this release adds no settings, UI, or workflow changes

Included fixes

• unified handling for Zotero's missing-item false sentinel from fix: normalize missing Zotero items #66
• development dependency updates from chore(deps-dev): bump the all-non-major group across 1 directory with 4 updates #64

Validation

• npm run test:unit — 408 passing
• python test/pdfTranslator/test_bridge.py — 95 passing
• npm run build — passed; generated AIdea-3.3.1.xpi
• npm run lint:check — passed
• generated manifest/update metadata report version 3.3.1 and Zotero compatibility 6.999–9.*