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/deploy.html

@@ -117,11 +117,18 @@
                 {{else if eq .Type "path"}}
                 {{if $.StoragePaths}}
                 <select id="field-{{.EnvVar}}" name="{{.EnvVar}}" class="form-control"
-                        {{if $.AlreadyDeployed}}disabled{{end}}>
+                        {{if $.AlreadyDeployed}}disabled{{end}}
+                        onchange="checkStorageSpace(this)">
                     {{range $.StoragePaths}}
-                    <option value="{{.Path}}">{{.Label}} ({{.Path}})</option>
+                    <option value="{{.Path}}" data-free-percent="{{printf "%.0f" .FreePercent}}"
+                            {{if .IsDefault}}selected{{end}}>
+                        {{.Label}} — {{.FreeHuman}} szabad{{if .IsDefault}} ★{{end}}
+                    </option>
                     {{end}}
                 </select>
+                <div id="storage-space-warn" class="form-hint" style="color:var(--yellow);display:none">
+                    ⚠️ A kiválasztott tárhely majdnem megtelt.
+                </div>
                 {{else}}
                 <input type="text" id="field-{{.EnvVar}}" name="{{.EnvVar}}"
                        class="form-control" value="{{.Default}}"
@@ -177,6 +184,19 @@
 </div>
 
 <script>
+function checkStorageSpace(sel) {
+    var opt = sel.options[sel.selectedIndex];
+    var warn = document.getElementById('storage-space-warn');
+    if (!warn) return;
+    var freePct = parseFloat(opt.getAttribute('data-free-percent') || '100');
+    warn.style.display = freePct < 20 ? 'block' : 'none';
+}
+// Check on page load
+document.addEventListener('DOMContentLoaded', function() {
+    var sel = document.querySelector('select[onchange="checkStorageSpace(this)"]');
+    if (sel) checkStorageSpace(sel);
+});
+
 function generatePassword(fieldId) {
     const chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
     let pass = '';