fix(growth): 审计修复 — CRITICAL 编译错误 + LOW 静默数据丢失

- CRITICAL: extraction_adapter.rs extract_with_prompt() 使用不存在的
  zclaw_types::Error::msg()，改为 ZclawError::InvalidInput/ZclawError::LlmError
- LOW: feedback_collector.rs save() 中 serde_json::to_string().unwrap_or_default()
  改为显式错误处理 + warn 日志 + continue，避免静默存空数据

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

@@ -233,8 +233,8 @@ impl LlmDriverForExtraction for TauriExtractionDriver {
         user_prompt: &str,
     ) -> Result<String> {
         if messages.len() < 2 {
-            return Err(zclaw_types::Error::msg(
-                "Too few messages for combined extraction",
+            return Err(zclaw_types::ZclawError::InvalidInput(
+                "Too few messages for combined extraction".to_string(),
             ));
         }
 
@@ -276,8 +276,8 @@ impl LlmDriverForExtraction for TauriExtractionDriver {
             .join("");
 
         if response_text.is_empty() {
-            return Err(zclaw_types::Error::msg(
-                "Empty response from LLM for combined extraction",
+            return Err(zclaw_types::ZclawError::LlmError(
+                "Empty response from LLM for combined extraction".to_string(),
             ));
         }