v0.109.0: soft-quota gate + usage bar + offsite report status (SLICE 4)

QuotaGB rides the descriptor into OffboxTarget; RepoSizeBytes persisted
from restic stats. Pre-run gate: >=100% refuses NEW backups (Hungarian
notice + operator alert) but prune STILL runs (red-proofed) and restore is
never gated; >=80% warns. /backups usage bar (quota>0 only). The hub
report gains the non-secret offsite status object for the OffsiteChecker.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6

controller/internal/web/templates/backups.html

@@ -140,6 +140,15 @@
             <div class="stat-label">{{if .Offbox.Enabled}}{{.Offbox.RepoPath}}{{else}}A NAS-mentés ki van kapcsolva{{end}}</div>
         </div>
     </div>
+    {{if and .Offbox.Enabled (gt .Offbox.QuotaGB 0)}}
+    <!-- SLICE 4: soft-quota usage bar (shared model; quota_gb from the hub descriptor). -->
+    <div id="offbox-quota-bar" style="max-width:560px;margin:.5rem 0">
+        <div class="stat-label" style="margin-bottom:.25rem">Tárhelykeret: {{if .Offbox.RepoSizeHuman}}{{.Offbox.RepoSizeHuman}}{{else}}0{{end}} / {{.Offbox.QuotaGB}} GB ({{.OffboxQuotaPct}}%)</div>
+        <div style="background:var(--border,#334);border-radius:4px;height:8px;overflow:hidden">
+            <div style="height:8px;border-radius:4px;width:{{.OffboxQuotaPct}}%;background:{{if ge .OffboxQuotaPct 100}}var(--crit,#e5484d){{else if ge .OffboxQuotaPct 80}}var(--warn,#f5a524){{else}}var(--ok,#30a46c){{end}}"></div>
+        </div>
+    </div>
+    {{end}}
     {{if .Offbox.LastError}}<p class="form-hint" style="color:var(--crit)">Utolsó hiba: {{.Offbox.LastError}}</p>{{end}}
     {{if .Offbox.LastWarning}}<p class="form-hint" style="color:var(--warn)">{{.Offbox.LastWarning}}</p>{{end}}
     {{if and .OffboxConfigured (ne .Offbox.EscrowState "escrowed")}}