fix: remove personalized sources from Phase 2 web search prompt

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/services/synthesis.rs

@@ -564,7 +564,7 @@ async fn run_generation_inner(
 
         let search_schema = crate::services::llm::schema::build_category_schema(&user_categories, settings.max_items_per_category);
         let current_date = Utc::now().format("%A %d %B %Y").to_string();
-        let (sys_prompt, usr_prompt) = crate::services::prompts::build_search_prompt(&settings, &sources, &current_date, &[], Some(&category_gaps));
+        let (sys_prompt, usr_prompt) = crate::services::prompts::build_search_prompt(&settings, &[], &current_date, &[], Some(&category_gaps));
 
         let llm_start = std::time::Instant::now();
         let raw_results = provider.call_llm(&model_websearch, &sys_prompt, &usr_prompt, &search_schema).await?;