feat(#445): full Models tab parity — settings, aux tasks, MOA config

* feat(#445): full Models tab — settings panel, aux tasks, MOA config, model assignment

Main features added:
- Model Settings card at top of screen with main model, aux tasks, MOA summary
- Main model assignment via /api/model/set with expensive model confirm flow
- Auxiliary tasks dialog with per-task model override and reset-all
- MOA config dialog with preset management and reference/aggregator model picker
- Model picker dialog reused for main model, aux tasks, and MOA slot selection
- Kept existing provider browse + pin/unpin/search

New data models: AuxiliaryModelsResponse, MoaConfigResponse,
ModelAssignmentRequest/Response
New API endpoints: GET /api/model/auxiliary, GET/PUT /api/model/moa,
POST /api/model/set

* test(#445): add aux + MOA mock endpoints to E2eIntegrationTest

testModelOptionsSelection_success was failing because the ViewModel's init
block now calls getAuxiliaryModels() and getMoaConfig() which weren't mocked.
Added proper mock returns + imports for the new types.

* fix(#445): correct mock endpoint name in E2eIntegrationTest

- getMoaConfig -> getMoaModels (matches API service method name)
- Add explicit type parameter Response.success<MoaConfigResponse>
  to fix Kotlin type inference

* fix(#445): add missing main param to AuxiliaryModelsResponse mock

AuxiliaryModelsResponse requires a MainModelAssignment for its
'main' field. Added the parameter with a dummy value and the
corresponding import.

* fix(#445): update toast assertion in test to match new message format

ViewModel now produces 'Successfully set profile model to ronia'
instead of the old 'Successfully set model to ronia'.

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

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

@@ -4,6 +4,7 @@ import com.google.gson.JsonElement
 import com.m57.hermescontrol.data.model.AchievementsResponse
 import com.m57.hermescontrol.data.model.ActiveProfileResponse
 import com.m57.hermescontrol.data.model.AgentPluginInstallBody
+import com.m57.hermescontrol.data.model.AuxiliaryModelsResponse
 import com.m57.hermescontrol.data.model.ConfigSchemaResponse
 import com.m57.hermescontrol.data.model.ConfigUpdateRequest
 import com.m57.hermescontrol.data.model.CreateCronJobRequest
@@ -25,6 +26,9 @@ import com.m57.hermescontrol.data.model.McpServersResponse
 import com.m57.hermescontrol.data.model.MessagingPlatformResponse
 import com.m57.hermescontrol.data.model.MessagingPlatformTestResult
 import com.m57.hermescontrol.data.model.MessagingPlatformUpdate
+import com.m57.hermescontrol.data.model.MoaConfigResponse
+import com.m57.hermescontrol.data.model.ModelAssignmentRequest
+import com.m57.hermescontrol.data.model.ModelAssignmentResponse
 import com.m57.hermescontrol.data.model.ModelOptionsResponse
 import com.m57.hermescontrol.data.model.PairingApproveRequest
 import com.m57.hermescontrol.data.model.PairingResponse
@@ -285,6 +289,22 @@ interface HermesApiService {
     @GET("api/model/options")
     suspend fun getModelOptions(): Response<ModelOptionsResponse>
 
+    @GET("api/model/auxiliary")
+    suspend fun getAuxiliaryModels(): Response<AuxiliaryModelsResponse>
+
+    @GET("api/model/moa")
+    suspend fun getMoaModels(): Response<MoaConfigResponse>
+
+    @PUT("api/model/moa")
+    suspend fun saveMoaModels(
+        @Body body: MoaConfigResponse,
+    ): Response<MoaConfigResponse>
+
+    @POST("api/model/set")
+    suspend fun setModelAssignment(
+        @Body body: ModelAssignmentRequest,
+    ): Response<ModelAssignmentResponse>
+
     @GET("api/logs")
     suspend fun getLogs(
         @Query("limit") limit: Int? = null,