v0.10.0: Phase B — Storage Management UI Polish & Health Severity Fix

- Health severity fix: mount-point check downgraded from issue (FAIL) to warning (WARN)
- All storage health messages translated to Hungarian
- Success flash messages for all storage operations
- Edit storage path labels (inline edit UI + backend)
- App details per storage path on settings page (expandable list with names + sizes)
- Storage badge on stacks page showing which storage each app uses
- Deploy dropdown with free space display and low-space warning (<20%)
- Filesystem & disk info on settings page (ext4/btrfs, device, model via findmnt)
- Backup page storage context with per-app storage label badges

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

controller/internal/web/templates/backups.html

@@ -254,9 +254,10 @@
                         <span class="app-backup-name">{{.DisplayName}}</span>
                     </div>
                     {{end}}
-                    {{if .HasHDDData}}
-                    <span class="app-backup-size mono">{{.HDDSizeHuman}} (HDD)</span>
-                    {{end}}
+                    <div style="display:flex;align-items:center;gap:.5rem">
+                        {{if .StorageLabel}}<span class="meta-badge meta-badge-storage">{{.StorageLabel}}</span>{{end}}
+                        {{if .HasHDDData}}<span class="app-backup-size mono">{{.HDDSizeHuman}}</span>{{end}}
+                    </div>
                 </div>
                 <div class="app-backup-details">
                     {{range .HDDPaths}}