fix: search_extension should not panic when ext is not found (#983)

This commit fixes a bug that the search_extension() function panics
when the "GET /store/_search" interface returns a 404 response.

```
GET /store/_search?query=<query string>
{"_id":"_search","result":"not_found"}
```

It also improves the panic message by including varaible "response" in it,
so that we can inspect the actual response.

```
let hits_json = response.remove("hits").unwrap_or_else(|| {
    panic!(
        "the JSON response should contain field [hits], response [{:?}]",
        response
    )
});
```

docs/content.en/docs/release-notes/_index.md

@@ -11,6 +11,9 @@ Information about release notes of Coco App is provided here.
 ### ❌ Breaking changes  
 ### 🚀 Features  
 ### 🐛 Bug fix  
+
+- fix: search_extension should not panic when ext is not found #983
+
 ### ✈️ Improvements  
 
 ## 0.9.0 (2025-11-19)

src-tauri/src/extension/third_party/install/store.rs

@@ -104,15 +104,23 @@ pub(crate) async fn search_extension(
     .await
     .map_err(|e| format!("Failed to send request: {:?}", e))?;
 
+    if response.status() == StatusCode::NOT_FOUND {
+        return Ok(Vec::new());
+    }
+
     // The response of a ES style search request
     let mut response: JsonObject<String, Json> = response
         .json()
         .await
         .map_err(|e| format!("Failed to parse response: {:?}", e))?;
 
-    let hits_json = response
-        .remove("hits")
-        .expect("the JSON response should contain field [hits]");
+    let hits_json = response.remove("hits").unwrap_or_else(|| {
+        panic!(
+            "the JSON response should contain field [hits], response [{:?}]",
+            response
+        )
+    });
+
     let mut hits = match hits_json {
         Json::Object(obj) => obj,
         _ => panic!(