fix: add missing fields to syntheses test settings payload

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/tests/api_syntheses_test.rs

@@ -627,15 +627,21 @@ async fn generate_pipeline_resolves_model_from_admin_config() {
 
     // Configure user settings with provider and categories
     let settings = serde_json::json!({
+        "theme": "Intelligence Artificielle",
+        "max_age_days": 7,
         "categories": ["Test Category"],
-        "ai_provider": "openai",
+        "max_items_per_category": 4,
-        "ai_model": "",
+        "max_articles_per_source": 3,
-        "ai_model_websearch": "",
         "use_llm_for_source_links": false,
         "use_brave_search": false,
-        "use_llm_for_article_extraction": false,
         "article_history_days": 90,
-        "batch_size": 5
+        "batch_size": 5,
+        "search_agent_behavior": "",
+        "ai_provider": "openai",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
     let (settings_status, _) = app
         .put_with_session("/api/v1/settings", &settings, &session)