Fix socket URL auto-fill for extension stores

Added handleStore() calls in GetStores and getLoaderByStoreName to
automatically fill empty socket URLs using GetExtensionSocketPath().

This ensures stores loaded from config file get correct socket paths
without hardcoding user-specific paths, making the configuration
portable across different users and systems.

Fixes issue where AI extension showed "Not Ready" status due to
outdated socket path in stores.yaml configuration.

Author: KariHall619

pkg/server/remote_server.go

@@ -1225,6 +1225,9 @@ func (s *server) GetStores(ctx context.Context, in *SimpleQuery) (reply *Stores,
 		wg := sync.WaitGroup{}
 		mu := sync.Mutex{}
 		for _, item := range stores {
+			// Auto-fill socket URL if empty
+			handleStore(&item)
+
 			skip := false
 			for _, kind := range kinds.Data {
 				if in != nil && in.Kind != "" && !slices.Contains(kind.Categories, in.Kind) {
@@ -1670,6 +1673,8 @@ func (s *server) getLoaderByStoreName(storeName string) (loader testing.Writer,
 	var store *testing.Store
 	store, err = testing.NewStoreFactory(s.configDir).GetStore(storeName)
 	if err == nil && store != nil {
+		// Auto-fill socket URL if empty
+		handleStore(store)
 		loader, err = s.storeWriterFactory.NewInstance(*store)
 		if err != nil {
 			err = fmt.Errorf("failed to new grpc loader from store %s, err: %v", store.Name, err)