v0.12.7: mandatory HDD backup, pre-dump, restore for all apps

Fix 1: HDD data backup is now mandatory for all deployed apps.
resolveAppBackupPaths() iterates ListDeployedStacks() directly — no
longer reads GetAppBackupMap() or checks the Enabled flag. DiscoverAppData()
drops backupPrefs parameter; BackupEnabled is set from HasHDDData.
Five dead settings methods removed: IsAppBackupEnabled, SetAppBackup,
GetAppBackupMap, SetAppBackupBulk, GetAppBackupPrefs.

Fix 2: Cross-drive backup now triggers a fresh DB dump (DumpStackDB)
before running. DBDumper interface added to crossdrive.go; Manager
implements it; SetDBDumper wired in main.go. Non-fatal — proceeds with
user data backup even if DB dump fails.

Fix 3: Restore dropdown shows ALL deployed apps (not just HDD+enabled).
restore.go rewritten: always restores config+DB, adds user data if hasHDD.
UI shows restore type banner (full / config+DB / config only) with
color-coded styling. Snapshot API clarified for non-HDD apps.

Fix 4: "Docker kötetek" → "Konfiguráció" — named volumes are not in
the restic backup paths; compose files + app.yaml are what's backed up.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

controller/internal/web/templates/style.css

@@ -1921,6 +1921,21 @@ a.stat-card:hover {
     line-height: 1.4;
 }
 
+/* --- Backup page: Restore type info banners --- */
+.restore-info {
+    padding: 0.5rem 0.75rem;
+    border-radius: 6px;
+    font-size: 0.85rem;
+    background: rgba(59, 130, 246, 0.1);
+    border: 1px solid rgba(59, 130, 246, 0.3);
+    color: #93c5fd;
+}
+.restore-info-partial {
+    background: rgba(251, 191, 36, 0.1);
+    border-color: rgba(251, 191, 36, 0.3);
+    color: #fcd34d;
+}
+
 /* --- Backup page: Restore section --- */
 .restore-section {
     display: flex;