refactor: clean install backup — dbi.config and prod.keys only

- Backup/restore DBI settings file instead of whole DBI folder
- Remove Tinfoil folder backup/restore
- Adjust deletion_lists_clean.h comments; UI strings in install_clean.c

Made-with: Cursor

source/backup.h

@@ -7,6 +7,9 @@
 #include <utils/types.h>
 
 #define TEMP_BACKUP_PATH "sd:/temp_backup"
+/** DBI settings; preserved across clean install (not whole DBI folder). */
+#define DBI_CONFIG_PATH "sd:/switch/DBI/dbi.config"
+#define TEMP_BACKUP_DBI_CONFIG TEMP_BACKUP_PATH "/dbi.config"
 
 /** Live HorizonOC settings (Overclock tool). */
 #define HORIZON_OC_CONFIG_PATH "sd:/config/horizon-oc/config.ini"
@@ -14,7 +17,7 @@
 #define HORIZON_OC_UPDATE_BACKUP_DIR "sd:/.omninx_oc_update"
 #define HORIZON_OC_UPDATE_BACKUP_INI HORIZON_OC_UPDATE_BACKUP_DIR "/config.ini"
 
-// Backup user data (DBI, Tinfoil, prod.keys) before clean install
+// Backup user data (DBI dbi.config, prod.keys) before clean install
 int backup_user_data(void);
 
 // Restore user data after clean install