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/test/java/com/m57/hermescontrol/E2eIntegrationTest.kt

@@ -1285,7 +1285,7 @@ class E2eIntegrationTest {
             val provider = ModelProvider("ollama", "Ollama", false, true, listOf("llama3"), 1, null, true, null, null)
             val profile = ProfileInfo("default", null, true, "llama3", "ollama", null, null, null, null)
 
-            coEvery { mockApiService.getModelOptions(any()) } returns
+            coEvery { mockApiService.getModelOptions(any(), any()) } returns
                 Response.success(ModelOptionsResponse(listOf(provider)))
             coEvery { mockApiService.getActiveProfile() } returns
                 Response.success(ActiveProfileResponse("default", null))
@@ -1340,7 +1340,7 @@ class E2eIntegrationTest {
             val provider = ModelProvider("ollama", "Ollama", false, true, listOf("llama3"), 1, null, true, null, null)
             val profile = ProfileInfo("default", null, true, "llama3", "ollama", null, null, null, null)
 
-            coEvery { mockApiService.getModelOptions(any()) } returns
+            coEvery { mockApiService.getModelOptions(any(), any()) } returns
                 Response.success(ModelOptionsResponse(listOf(provider)))
             coEvery { mockApiService.getActiveProfile() } returns
                 Response.success(ActiveProfileResponse("default", null))
@@ -1364,7 +1364,7 @@ class E2eIntegrationTest {
                 )
 
             val capturedRefresh = mutableListOf<Boolean>()
-            coEvery { mockApiService.getModelOptions(any()) } answers {
+            coEvery { mockApiService.getModelOptions(any(), any()) } answers {
                 capturedRefresh.add(firstArg())
                 Response.success(ModelOptionsResponse(listOf(provider)))
             }