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Jason
8669879ad0
Introduce a one-time welcome dialog that explains CC Switch's workflow to new users: how their existing config is preserved as a "default" provider and how the bundled "Official" preset enables one-click revert. Upgrade users are excluded by checking is_providers_empty() at startup and never see the dialog. Persistence follows the existing *_confirmed convention in AppSettings (proxy/usage/stream_check/failover), stored in settings.json. The field is only written when the user explicitly clicks the confirm button, keeping its semantics strictly about user acknowledgement. Also adds two reusable DAO helpers: - Database::is_providers_empty for fresh-install detection, using EXISTS(SELECT 1) for a short-circuit query. - Database::get_bool_flag accepting "true" | "1", with init_default_official_providers migrated to use it. Dialog copy in zh/en/ja uses conditional phrasing so it stays accurate whether or not existing live config was found.