Release v1.1.0: pinhole projection defaults, viewer controls, and CI

[amariichi]

Summary

• make pinhole projection the default and add source/display projection controls for desktop and RawXR
• add 2D/SBS viewer controls including camera distance, model Z, and SBS eye swap, and align the README in English and Japanese
• add minimal GitHub Actions checks for frontend lint/build and backend ruff/syntax validation

Validation

• npm run lint
• npm run build
• uv run --extra dev python -m ruff check backend scripts
• python3 -m py_compile $(find backend scripts -name '*.py' -type f)