Add report logos and configurable folder scan depth

Report branding (top-left MSP logo, top-right client logo):
- Add MspLogo to AppSettings; client logo already on TenantProfile
- IUserSessionService.CurrentBranding composes MSP + active profile logo
- New reusable LogoUpload component (InputFile -> base64 LogoData, 512KB cap)
- MSP logo upload in Settings; optional client logo in profile create/edit
- Wire ReportBranding into all 6 HTML export pages
- Fix EditProfile dropping ClientLogo on edit

Storage metrics: expose folder scan depth (0-20) in scan options UI,
passed to existing StorageScanOptions.FolderDepth recursion.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Components/Pages/Profiles.razor

@@ -146,6 +146,12 @@
             }
         </div>
 
+        <div class="form-group">
+            <label class="form-label">Client logo (optional)</label>
+            <small class="text-muted d-block" style="margin-bottom:6px">Shown top-right on exported reports for this client.</small>
+            <LogoUpload Value="_form.ClientLogo" ValueChanged="(LogoData? l) => _form.ClientLogo = l" />
+        </div>
+
         <div class="flex-row mt-8">
             <button class="btn btn-primary" @onclick="SaveProfile">Save</button>
             <button class="btn btn-secondary" @onclick="CancelForm">Cancel</button>
@@ -214,7 +220,7 @@
     private void EditProfile(TenantProfile p)
     {
         _editing  = p;
-        _form     = new TenantProfile { Id = p.Id, Name = p.Name, TenantUrl = p.TenantUrl, TenantId = p.TenantId, ClientId = p.ClientId };
+        _form     = new TenantProfile { Id = p.Id, Name = p.Name, TenantUrl = p.TenantUrl, TenantId = p.TenantId, ClientId = p.ClientId, ClientLogo = p.ClientLogo };
         _showForm = true;
         _formError = _pageError = string.Empty;
     }