fix(butler): 降低痛点检测阈值 3→2/2→1，更早发现用户需求

desktop/src-tauri/src/intelligence/pain_aggregator.rs

@@ -322,10 +322,10 @@ pub fn analyze_for_pain_signals(messages: &[zclaw_types::Message]) -> Option<Pai
     let combined = user_frustrations.join(" ");
     let severity = if combined.contains("烦死了")
         || combined.contains("受不了")
-        || user_frustrations.len() >= 3
+        || user_frustrations.len() >= 2
     {
         PainSeverity::High
-    } else if user_frustrations.len() >= 2 {
+    } else if user_frustrations.len() >= 1 {
         PainSeverity::Medium
     } else {
         PainSeverity::Low