feat(doctor): per-source-kind capability breakdown line

Studio's Doctor page _ModulesPanel now shows the source
breakdown directly under the module/capability count:

  Modules: 6 loaded, 10 capabilities
  6 bundle · 3 mcp · 1 system

Reads `CapabilityEntry.sourceKind` (Phase D wire field).
Pre-0.12 hubs return empty sourceKind; the breakdown panel
falls back to grouping by the legacy `kind` string so older
deployments still see a useful count.

Two data-layer additions:
  - `DoctorSnapshot.capabilitiesBySource: Map<String, int>`
  - `_sourceBreakdown(Map<String, int>) -> String` renders
    the line in deterministic alphabetical order.

dart analyze + flutter test green (11 integration tests).

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/data/hub.dart

@@ -791,9 +791,19 @@ class HubService {
     // Module count = distinct module_name across capabilities.
     final moduleNames = <String>{for (final c in caps) c.moduleName};
 
+    // Per-source-kind breakdown (0.12+). Pre-0.12 hubs return
+    // empty `source_kind` strings — group those under `kind`
+    // as a fallback so the doctor panel still shows a count.
+    final bySource = <String, int>{};
+    for (final c in caps) {
+      final key = c.sourceKind.isEmpty ? c.kind : c.sourceKind;
+      bySource[key] = (bySource[key] ?? 0) + 1;
+    }
+
     return DoctorSnapshot(
       moduleCount: moduleNames.length,
       capabilityCount: caps.length,
+      capabilitiesBySource: bySource,
       pendingApprovals: approvals.length,
       eventChainTotal: chain.total.toInt(),
       eventChainVerified: chain.verified.toInt(),
@@ -862,6 +872,10 @@ class DoctorSnapshot {
   /// Filesystem paths the daemon owns. Empty fields when the
   /// hub couldn't resolve them (older daemon, no $HOME).
   final DaemonPathsSnapshot paths;
+  /// Per-source-kind capability count: bundle / system / mcp /
+  /// n8n / temporal / webhook (0.12+). Pre-0.12 hubs return
+  /// an empty map and the panel falls back to a flat count.
+  final Map<String, int> capabilitiesBySource;
 
   const DoctorSnapshot({
     required this.moduleCount,
@@ -873,6 +887,7 @@ class DoctorSnapshot {
     required this.services,
     required this.update,
     required this.paths,
+    this.capabilitiesBySource = const {},
   });
 
   bool get chainHealthy => eventChainTamperedAt == null;

lib/pages/doctor.dart

@@ -656,6 +656,15 @@ class _DaemonActionsCardState extends State<_DaemonActionsCard> {
   }
 }
 
+/// Format the per-source-kind capability count map as a
+/// human-readable line like "6 bundle · 3 mcp · 1 system".
+/// Sorted alphabetically for deterministic rendering.
+String _sourceBreakdown(Map<String, int> bySource) {
+  final entries = bySource.entries.toList()
+    ..sort((a, b) => a.key.compareTo(b.key));
+  return entries.map((e) => '${e.value} ${e.key}').join(' · ');
+}
+
 class _ModulesPanel extends StatelessWidget {
   final DoctorSnapshot snapshot;
 
@@ -677,6 +686,10 @@ class _ModulesPanel extends StatelessWidget {
                 color: theme.colorScheme.onSurfaceVariant,
               ),
               const SizedBox(width: FaiSpace.sm),
+              Expanded(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
                     Text(
                       l.doctorModulesPanelSummary(
                         snapshot.moduleCount,
@@ -684,7 +697,18 @@ class _ModulesPanel extends StatelessWidget {
                       ),
                       style: theme.textTheme.bodyMedium,
                     ),
-              const Spacer(),
+                    if (snapshot.capabilitiesBySource.isNotEmpty) ...[
+                      const SizedBox(height: 2),
+                      Text(
+                        _sourceBreakdown(snapshot.capabilitiesBySource),
+                        style: theme.textTheme.bodySmall?.copyWith(
+                          color: theme.colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                    ],
+                  ],
+                ),
+              ),
               FaiPill(
                 label: snapshot.moduleCount > 0
                     ? l.doctorPillLoaded