Fix DWeb install-url paths for dev/stable

[Gaubee]

• DWEB install links use absolute runtime URLs and CI metadata logo uses SITE_ORIGIN\n- [x] allow context menu in Settings > About for Dweb devtools\n- [x] APP_VERSION injected (stable=package.json, beta=-MMDDHH UTC via VITE_DEV_MODE)\n- [x] release.ts updated to rely on CI tag/release