feat: refactor storage configuration to use dedicated storage package and add new storage types

BREAKING CHANGE: remove deprecated config

config/storage/factory.go

@@ -0,0 +1,63 @@
+package storage
+
+import (
+	"fmt"
+	"reflect"
+
+	"github.com/krau/SaveAny-Bot/types"
+	"github.com/mitchellh/mapstructure"
+	"github.com/spf13/viper"
+)
+
+var storageFactories = map[types.StorageType]func(cfg *BaseConfig) (StorageConfig, error){
+	types.StorageTypeLocal:  createStorageConfig(&LocalStorageConfig{}),
+	types.StorageTypeAlist:  createStorageConfig(&AlistStorageConfig{}),
+	types.StorageTypeWebdav: createStorageConfig(&WebdavStorageConfig{}),
+	types.StorageTypeMinio:  createStorageConfig(&MinioStorageConfig{}),
+}
+
+func createStorageConfig(configType StorageConfig) func(cfg *BaseConfig) (StorageConfig, error) {
+	return func(cfg *BaseConfig) (StorageConfig, error) {
+		configValue := reflect.New(reflect.TypeOf(configType).Elem()).Interface().(StorageConfig)
+
+		reflect.ValueOf(configValue).Elem().FieldByName("BaseConfig").Set(reflect.ValueOf(*cfg))
+
+		if err := mapstructure.Decode(cfg.RawConfig, configValue); err != nil {
+			return nil, fmt.Errorf("failed to decode %s storage config: %w", cfg.Type, err)
+		}
+
+		return configValue, nil
+	}
+}
+
+func LoadStorageConfigs(v *viper.Viper) ([]StorageConfig, error) {
+	var baseConfigs []BaseConfig
+	if err := v.UnmarshalKey("storages", &baseConfigs); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal storage configs: %w", err)
+	}
+
+	var configs []StorageConfig
+	for _, baseCfg := range baseConfigs {
+		if !baseCfg.Enable {
+			continue
+		}
+
+		factory, ok := storageFactories[types.StorageType(baseCfg.Type)]
+		if !ok {
+			return nil, fmt.Errorf("unsupported storage type: %s", baseCfg.Type)
+		}
+
+		cfg, err := factory(&baseCfg)
+		if err != nil {
+			return nil, fmt.Errorf("failed to create storage config for %s: %w", baseCfg.Name, err)
+		}
+
+		if err := cfg.Validate(); err != nil {
+			return nil, fmt.Errorf("invalid storage config for %s: %w", baseCfg.Name, err)
+		}
+
+		configs = append(configs, cfg)
+	}
+
+	return configs, nil
+}