Introduce Public Station Diary feature and QSO filtering support.
- Add migrations: 255 adds public_station_diary_enabled option (default enabled), 256 adds qso_date_start, qso_date_end, qso_satellite_only columns to notes.
- Bump migration version to 256.
- Add controller actions (Options::public_diary, public_diary_save) and new options view to manage the public diary setting; add sidebar link.
- Extend Note model to persist QSO filter fields and provide new methods to fetch QSO lists/summaries for date ranges and satellite-only filtering; wire filter usage into summary generation.
- Update notes add/edit views to include QSO Summary Filters (date range + satellite-only).
- Add translations for the new options keys across multiple language files.
- Update public station diary listing view styling/path and minor content cleanup; other views updated to support feature.
- Remove obsolete cache files (.htaccess, index.html).
These changes enable admins to toggle a public station diary and let note authors control which QSOs are included in summaries via date ranges and SAT-only filtering.
