convert error fromating to %w everywhere (#6995)

weed/sftpd/user/filestore.go

@@ -61,7 +61,7 @@ func NewFileStore(filePath string) (*FileStore, error) {
 	if _, err := os.Stat(filePath); os.IsNotExist(err) {
 		// Create an empty users array
 		if err := os.WriteFile(filePath, []byte("[]"), 0600); err != nil {
-			return nil, fmt.Errorf("failed to create user store file: %v", err)
+			return nil, fmt.Errorf("failed to create user store file: %w", err)
 		}
 	}
 
@@ -79,12 +79,12 @@ func (s *FileStore) loadUsers() error {
 
 	data, err := os.ReadFile(s.filePath)
 	if err != nil {
-		return fmt.Errorf("failed to read user store file: %v", err)
+		return fmt.Errorf("failed to read user store file: %w", err)
 	}
 
 	var users []*User
 	if err := json.Unmarshal(data, &users); err != nil {
-		return fmt.Errorf("failed to parse user store file: %v", err)
+		return fmt.Errorf("failed to parse user store file: %w", err)
 	}
 
 	// Clear existing users and add the loaded ones
@@ -119,11 +119,11 @@ func (s *FileStore) saveUsers() error {
 
 	data, err := json.MarshalIndent(users, "", "  ")
 	if err != nil {
-		return fmt.Errorf("failed to serialize users: %v", err)
+		return fmt.Errorf("failed to serialize users: %w", err)
 	}
 
 	if err := os.WriteFile(s.filePath, data, 0600); err != nil {
-		return fmt.Errorf("failed to write user store file: %v", err)
+		return fmt.Errorf("failed to write user store file: %w", err)
 	}
 
 	return nil