Filter cameras by path group visibility

[sbca68aiassistant]

Summary

• add visibleForFlats to camera path groups via houses_paths.house_path_visible_for_flats
• expose the field in houses/path API and in the house camera group UI
• inherit empty child-group visibility from the nearest parent group
• filter house cameras in getAddressList, cctv/all, and cctv/allTree before URL/token generation

Tests

• docker run --rm -v "$PWD":/app -w /app php:8.1-cli php -l ... for changed PHP files
• node --check client/modules/addresses/houses.js
• python3 -m json.tool client/modules/addresses/i18n/ru.json
• python3 -m json.tool client/modules/addresses/i18n/en.json
• python3 -m json.tool server/data/install.json
• git diff --check
• smoke-test for path visibility filtering/parsing