feat: expose reload_required in AuthStatus; destale ~/.fai doc comments

Stubs regenerated from the current proto: AuthStatusResponse gains
reload_required (true when the hub's on-disk auth config or its env
vars diverge from the live validator — ReloadAuth pending), and the
generated comments pick up the .chain bundle wording. Hand-written
dartdoc in hub_client.dart updated from the pre-rename ~/.fai paths
and .fai bundle extension.

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

lib/src/generated/chain/v1/hub.pbgrpc.dart

@@ -434,7 +434,7 @@ class HubAdminClient extends $grpc.Client {
     return $createUnaryCall(_$removeStore, request, options: options);
   }
 
-  /// Install a module from a .fai bundle (local path or http(s) URL).
+  /// Install a module from a .chain bundle (local path or http(s) URL).
   $grpc.ResponseFuture<$0.InstallModuleResponse> installModule(
     $0.InstallModuleRequest request, {
     $grpc.CallOptions? options,
@@ -467,7 +467,7 @@ class HubAdminClient extends $grpc.Client {
 
   /// Read the inline-docs (MODULE.md / MODULE.<locale>.md) of an
   /// installed module from disk. No network fetch, no provider-
-  /// specific URL probing — the docs ship in the .fai bundle and
+  /// specific URL probing — the docs ship in the .chain bundle and
   /// live next to module.wasm on disk after install. Returns an
   /// empty body when the module is installed but ships no inline
   /// docs; Studio uses that to hide the docs button entirely.