v0.318.0: the internal data place, partitions, an honest whole-box backup offer (R-1084), sys_drive never offered (R-1082)

felhom.eu architecture/16 §4-§6 (build B). MinAgent 0.157.0 — the internal place and the partitions appear only when
agent >= 0.158.0 reports them. Tests red-proved; four parity fixtures refreshed (only the new lines).

Claude-Session: https://claude.ai/code/session_012qRErfCoiTkvDK9N5XHbzb

controller/internal/web/testdata/i18n_parity/storage_empty.html

@@ -388,6 +388,8 @@ window.__registeredPaths=[];
     
     if(d.role!=='user-data' || !d.mount_path || d.mount_path.indexOf('/mnt/')!==0) return '';
     
+    if(d.kind==='internal') return '';
+    
     
     if(d.backup_target){
       return registered[regKey(d)] ? '' : '<div class="drive-actions"><button class="btn btn-xs btn-primary" onclick="registerDrive(\''+esc(d.mount_path)+'\')">Regisztrálás</button></div>';