fix(growth): HIGH-3 FeedbackCollector 信任度持久化

根因: FeedbackCollector 用纯内存 HashMap 存储信任度记录，重启后归零。

修复:
- FeedbackCollector 添加 viking: Option<Arc<VikingAdapter>> 字段
- 添加 with_viking() 构造器
- 添加 save(): 遍历 trust_records → MemoryEntry → VikingAdapter 存储
- 添加 load(): find_by_prefix 反序列化回 HashMap
- EvolutionEngine::new()/from_experience_store() 传入 VikingAdapter
- submit_feedback() 改为 async，提交后自动调用 save()
- 添加 load_feedback() 供启动时恢复

测试: save_and_load_roundtrip + load_without_viking + save_without_viking

crates/zclaw-growth/src/evolution_engine.rs

@@ -49,8 +49,8 @@ pub struct EvolutionEngine {
 impl EvolutionEngine {
     pub fn new(viking: Arc<VikingAdapter>) -> Self {
         Self {
-            viking,
-            feedback: FeedbackCollector::new(),
+            viking: viking.clone(),
+            feedback: FeedbackCollector::with_viking(viking),
             config: EvolutionConfig::default(),
         }
     }
@@ -58,9 +58,10 @@ impl EvolutionEngine {
     /// Backward-compatible constructor
     /// 从 ExperienceStore 中提取共享的 VikingAdapter 实例
     pub fn from_experience_store(experience_store: Arc<ExperienceStore>) -> Self {
+        let viking = experience_store.viking().clone();
         Self {
-            viking: experience_store.viking().clone(),
-            feedback: FeedbackCollector::new(),
+            viking: viking.clone(),
+            feedback: FeedbackCollector::with_viking(viking),
             config: EvolutionConfig::default(),
         }
     }
@@ -142,9 +143,14 @@ impl EvolutionEngine {
     // 反馈闭环
     // -----------------------------------------------------------------------
 
-    /// 提交反馈并获取信任度更新
-    pub fn submit_feedback(&mut self, entry: FeedbackEntry) -> TrustUpdate {
-        self.feedback.submit_feedback(entry)
+    /// 提交反馈并获取信任度更新，自动持久化
+    pub async fn submit_feedback(&mut self, entry: FeedbackEntry) -> TrustUpdate {
+        let update = self.feedback.submit_feedback(entry);
+        // 非阻塞持久化：失败仅打日志，不影响返回值
+        if let Err(e) = self.feedback.save().await {
+            tracing::warn!("[EvolutionEngine] Failed to persist trust records: {}", e);
+        }
+        update
     }
 
     /// 获取需要优化的进化产物
@@ -178,6 +184,14 @@ impl EvolutionEngine {
     pub fn feedback(&self) -> &FeedbackCollector {
         &self.feedback
     }
+
+    /// 启动时加载已持久化的信任度记录
+    pub async fn load_feedback(&mut self) -> Result<usize> {
+        self.feedback
+            .load()
+            .await
+            .map_err(|e| zclaw_types::ZclawError::Internal(e))
+    }
 }
 
 #[cfg(test)]