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>

lib/data/hub.dart

@@ -1221,6 +1221,42 @@ class HubService {
   }
 
   /// Composite "doctor" snapshot. One round-trip per piece, run
+  /// Declare a host service in the operator config. Returns true
+  /// when a daemon restart is required for it to take effect
+  /// (always, today — services are read at start).
+  Future<bool> declareService({
+    required String name,
+    required String endpoint,
+    String healthPath = '',
+    List<String> tags = const [],
+  }) => _client.declareService(
+    name: name,
+    endpoint: endpoint,
+    healthPath: healthPath,
+    tags: tags,
+  );
+
+  /// Lightweight update probe for the shell's one-time hint:
+  /// null when the manifest is unreachable / no update / any
+  /// error — the hint simply stays away then.
+  Future<UpdateStatus?> checkHubUpdate() async {
+    try {
+      final r = await _client.checkUpdate().timeout(
+        const Duration(seconds: 3),
+      );
+      if (!r.updateAvailable) return null;
+      return UpdateStatus(
+        channel: r.channel,
+        localVersion: r.localVersion,
+        latestVersion: r.latestVersion,
+        updateAvailable: r.updateAvailable,
+        manifestReachable: r.manifestReachable,
+      );
+    } catch (_) {
+      return null;
+    }
+  }
+
   /// Version string of the RUNNING hub (from CheckUpdate's
   /// local_version — a local RPC field; the manifest fetch result
   /// is ignored). Empty when the hub is unreachable. Used by