fix(growth): Evolution Engine 审计修复 — 7项全部完成

HIGH-1: 提取共享 json_utils.rs，skill_generator/workflow_composer 去重
HIGH-2: FeedbackCollector Vec→HashMap，消除 unwrap() panic 风险
HIGH-3: ProfileUpdater 改为 collect_updates() 返回字段列表，
        growth.rs 直接 async 调用 update_field()，不再用 no-op 闭包
MEDIUM-1: EvolutionMiddleware 注入后自动 drain，防止重复注入
MEDIUM-2: PatternAggregator tools 提取改为直接收集 context 值
MEDIUM-3: evolution_engine.rs 移除 4 个未使用 imports
MEDIUM-4: workflow_composer parse_response pattern 参数加下划线
MEDIUM-7: SkillCandidate 添加 version 字段（默认=1）

测试: zclaw-growth 128 tests, zclaw-runtime 86 tests, workspace 0 failures

crates/zclaw-runtime/src/growth.rs

@@ -324,25 +324,21 @@ impl GrowthIntegration {
 
         // Update user profile from extraction signals (L1 enhancement)
         if let Some(profile_store) = &self.profile_store {
-            let _store = profile_store.clone();
-            let user_id = agent_id.to_string();
-            if let Err(e) = self
+            let updates = self
                 .profile_updater
-                .update(&user_id, &combined_extraction, move |uid, field, val| {
-                    // Synchronous wrapper — the actual update_field is async,
-                    // but we're already in an async context so we handle it via a future
-                    // For now, log and let the store handle it
-                    tracing::debug!(
-                        "[GrowthIntegration] Profile update: {} {}={}",
-                        uid,
-                        field,
-                        val
+                .collect_updates(&combined_extraction);
+            let user_id = agent_id.to_string();
+            for update in updates {
+                if let Err(e) = profile_store
+                    .update_field(&user_id, &update.field, &update.value)
+                    .await
+                {
+                    tracing::warn!(
+                        "[GrowthIntegration] Profile update failed for {}: {}",
+                        update.field,
+                        e
                     );
-                    Ok(())
-                })
-                .await
-            {
-                tracing::warn!("[GrowthIntegration] Profile update failed: {}", e);
+                }
             }
         }