Release v0.3.0

Added

• Plugin and theme strings (TranslatePress gettext tables): optional source (regular default, gettext) on get-stats, search-strings, get-strings, update-translations (per item, with plural_form) and get-change-log. Gettext items carry plural_form, original_plural, domain and context; get-stats and search-strings take a domain filter, get-strings with originals takes domain and context.
• Status language_file (TranslatePress status 4: text from the plugin's own .mo file). approve leaves it unchanged; reset on it is rejected with sat_invalid_input.
• Change log columns source and plural_form (sat_db_version 3); entries and revert items report them.
• Schema guard covers the gettext tables and their unique (original_id, plural_form) index; a mismatch only disables gettext (the index only gettext writes).
• Validator::check() gettext mode: sat_placeholder_mismatch uses TranslatePress's own rule (same tokens, any order), so a translation TranslatePress would silently ignore is rejected; with unit tests.

Changed

• update-translations and revert items include source (and plural_form for gettext).