Use absolute path for conf-file=; list all config files in UI

- EnsureManagedConfigHostedService: write conf-file=/absolute/path so
  dnsmasq finds the managed file regardless of CWD (e.g. systemd with CWD=/)
- Dnsmasq.razor: show Config files (load order) as single list with all
  paths (main, conf-dir, managed); fallback to Main/Managed when set unavailable

src/DnsmasqWebUI/Components/Pages/Dnsmasq.razor

@@ -22,16 +22,15 @@ else if (_status != null)
 {
     <section class="page-section">
         <h2 class="page-section-title">Service configuration</h2>
-        <ul class="list-unstyled small mb-0">
+        <p class="mb-1"><strong>Config files (load order):</strong></p>
-            <li><strong>Main config:</strong> @(_status.MainConfigPath ?? "—") @(_status.MainConfigPathExists ? "✓" : "(missing)")</li>
+        <ul class="list-unstyled small ms-2 mb-0">
-            <li><strong>Managed file:</strong> @(_status.ManagedFilePath ?? "—") @(_status.ManagedFilePathExists ? "✓" : "(not created yet)")</li>
+            @if (_configSet != null && _configSet.Files?.Count > 0)
-        </ul>
+            {
-        @if (_configSet != null && _configSet.Files?.Count > 0)
-        {
-            <p class="mb-1 mt-2"><strong>Config set (load order):</strong></p>
-            <ul class="list-unstyled small ms-2 mb-0">
                 @foreach (var f in _configSet.Files)
                 {
+                    var isMain = string.Equals(f.Path, _status.MainConfigPath, StringComparison.Ordinal);
+                    var isManaged = f.IsManaged;
+                    var exists = isMain ? _status.MainConfigPathExists : (isManaged ? _status.ManagedFilePathExists : (bool?)null);
                     <li>
                         @if (f.IsManaged)
                         {
@@ -41,12 +40,18 @@ else if (_status != null)
                         {
                             <span class="badge bg-secondary me-1">@(f.Source.ToString().ToLowerInvariant())</span>
                         }
-                        @f.FileName
+                        @f.Path
-                        <span class="text-muted">(@f.Path)</span>
+                        @if (exists == true) { <text> ✓</text> }
+                        @if (exists == false) { <text> @(isManaged ? "(not created yet)" : "(missing)")</text> }
                     </li>
                 }
-            </ul>
+            }
-        }
+            else
+            {
+                <li><strong>Main config:</strong> @(_status.MainConfigPath ?? "—") @(_status.MainConfigPathExists ? "✓" : "(missing)")</li>
+                <li><strong>Managed file:</strong> @(_status.ManagedFilePath ?? "—") @(_status.ManagedFilePathExists ? "✓" : "(not created yet)")</li>
+            }
+        </ul>
         <EffectiveConfigSection Status="_status" />
         @if (_status.ReloadCommandConfigured)
         {

src/DnsmasqWebUI/Services/EnsureManagedConfigHostedService.cs

@@ -46,7 +46,8 @@ public class EnsureManagedConfigHostedService : IApplicationHostedService
         var mainDir = Path.GetDirectoryName(mainFull) ?? "";
         var managedPath = Path.GetFullPath(set.ManagedFilePath);
         var managedDir = Path.GetDirectoryName(managedPath) ?? "";
-        var confFileLine = "conf-file=" + Path.GetRelativePath(mainDir, managedPath);
+        // Use absolute path so dnsmasq finds the file regardless of CWD (e.g. systemd may run with CWD=/).
+        var confFileLine = "conf-file=" + managedPath;
 
         var lines = File.Exists(mainFull)
             ? (await File.ReadAllLinesAsync(mainFull, DnsmasqFileEncoding.Utf8NoBom, cancellationToken)).ToList()
@@ -62,6 +63,7 @@ public class EnsureManagedConfigHostedService : IApplicationHostedService
             var value = trimmed.Length > 10 ? trimmed[10..].Trim() : "";
             if (string.IsNullOrEmpty(value))
                 continue;
+            // Resolve relative to main config dir; absolute value is used as-is.
             var resolved = Path.GetFullPath(Path.Combine(mainDir, value));
             if (string.Equals(resolved, managedPath, StringComparison.Ordinal))
                 lines.RemoveAt(i);