feat: add file deduplication and hash checking for uploads

- Implemented SHA-256 hashing for uploaded files to enable deduplication.
- Added CheckHash method to verify if a file with the same hash already exists.
- Updated Upload method to reuse existing media assets if a duplicate is found.
- Introduced a new hash column in the media_assets table to store file hashes.
- Enhanced the upload process to include progress tracking and hash calculation.
- Modified frontend to check for existing files before uploading and to show upload progress.
- Added vuedraggable for drag-and-drop functionality in the content editing view.

backend/database/models/media_assets.query.gen.go

@@ -39,6 +39,7 @@ func newMediaAsset(db *gorm.DB, opts ...gen.DOOption) mediaAssetQuery {
 	_mediaAssetQuery.CreatedAt = field.NewTime(tableName, "created_at")
 	_mediaAssetQuery.UpdatedAt = field.NewTime(tableName, "updated_at")
 	_mediaAssetQuery.DeletedAt = field.NewField(tableName, "deleted_at")
+	_mediaAssetQuery.Hash = field.NewString(tableName, "hash")
 
 	_mediaAssetQuery.fillFieldMap()
 
@@ -63,6 +64,7 @@ type mediaAssetQuery struct {
 	CreatedAt     field.Time
 	UpdatedAt     field.Time
 	DeletedAt     field.Field
+	Hash          field.String // File SHA-256 hash
 
 	fieldMap map[string]field.Expr
 }
@@ -93,6 +95,7 @@ func (m *mediaAssetQuery) updateTableName(table string) *mediaAssetQuery {
 	m.CreatedAt = field.NewTime(table, "created_at")
 	m.UpdatedAt = field.NewTime(table, "updated_at")
 	m.DeletedAt = field.NewField(table, "deleted_at")
+	m.Hash = field.NewString(table, "hash")
 
 	m.fillFieldMap()
 
@@ -125,7 +128,7 @@ func (m *mediaAssetQuery) GetFieldByName(fieldName string) (field.OrderExpr, boo
 }
 
 func (m *mediaAssetQuery) fillFieldMap() {
-	m.fieldMap = make(map[string]field.Expr, 14)
+	m.fieldMap = make(map[string]field.Expr, 15)
 	m.fieldMap["id"] = m.ID
 	m.fieldMap["tenant_id"] = m.TenantID
 	m.fieldMap["user_id"] = m.UserID
@@ -140,6 +143,7 @@ func (m *mediaAssetQuery) fillFieldMap() {
 	m.fieldMap["created_at"] = m.CreatedAt
 	m.fieldMap["updated_at"] = m.UpdatedAt
 	m.fieldMap["deleted_at"] = m.DeletedAt
+	m.fieldMap["hash"] = m.Hash
 }
 
 func (m mediaAssetQuery) clone(db *gorm.DB) mediaAssetQuery {