feat(doctor,shell): ollama host-service suggestion + hub-update hint (0.80.0)

Doctor: when the system AI uses an Ollama endpoint that no declared
host service covers (host:port match, /v1 suffix stripped), the
services panel says so in one sentence with a one-click 'declare as
host service' via the new DeclareService RPC — and states honestly
that it takes effect after a daemon restart (the restart button sits
on the same page). Pure suggestOllamaServiceEndpoint pins every
branch.

Shell: one slim, dismissible banner after connecting when the
release manifest offers a newer hub version; dismissal is persisted
per version so each release hints exactly once (pure
shouldShowUpdateHint + a widget test through the fake hub).
Deliberately manifest-based — Studio and hub versions are
independent counters, so a direct comparison would be wrong;
unreleased dev skew stays with the per-page classified states.
The probe stays inert under the test probe override: its timeout
timer leaked into hub_banner_test (the hermeticity class again).

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

test/support/fake_hub.dart

@@ -257,6 +257,20 @@ class FakeHubService extends Fake implements HubService {
   Future<List<N8nEndpointInfo>> listN8nEndpoints() =>
       _async('listN8nEndpoints', () => const []);
 
+  /// Scriptable update hint for the shell banner test.
+  UpdateStatus? updateHint;
+
+  @override
+  Future<UpdateStatus?> checkHubUpdate() async => updateHint;
+
+  @override
+  Future<bool> declareService({
+    required String name,
+    required String endpoint,
+    String healthPath = '',
+    List<String> tags = const [],
+  }) => _async('declareService', () => true);
+
   @override
   Future<DoctorSnapshot> doctor() => _async(
     'doctor',