fix(#497): pass include_unconfigured=true to /api/model/options (#498)

Backend commit 37a4cf900 (hermes-agent) flipped the default of
GET /api/model/options's include_unconfigured parameter from true
to false, so the mobile Models picker was silently regressing to
showing only configured/authenticated providers — the skeleton rows
for unconfigured providers (with setup-hint warnings) stopped arriving.

Add include_unconfigured as a @Query param defaulting to true so the
full provider universe is restored on the Models screen. Both current
call sites (ModelViewModel + ProfilesViewModel) invoke the API without
passing the new param, so they automatically pick up the true default.

app/src/main/java/com/m57/hermescontrol/data/remote/HermesApiService.kt

@@ -432,6 +432,7 @@ interface HermesApiService {
     @GET("api/model/options")
     suspend fun getModelOptions(
         @Query("refresh") refresh: Boolean = false,
+        @Query("include_unconfigured") includeUnconfigured: Boolean = true,
     ): Response<ModelOptionsResponse>
 
     @GET("api/model/auxiliary")