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/about_info.dart

@@ -4,7 +4,7 @@
 
 /// Studio's own build version. Bump on every UI release so the
 /// running app self-identifies.
-const String kStudioVersion = '0.79.0';
+const String kStudioVersion = '0.80.0';
 
 const String kProductName = 'Ch∆In Studio';
 const String kVendorName = 'Flemming.AI (F∆I)';