[feature] migrate to monorepo

backend/internal/storage/storage.go

@@ -0,0 +1,38 @@
+package storage
+
+//go:generate mockgen -source=storage.go -destination=mock/mock_storage.go -package=mock
+
+import (
+    "context"
+    "io"
+    "time"
+)
+
+// FileInfo represents metadata about a stored file
+type FileInfo struct {
+    ID          string    `json:"id"`
+    Name        string    `json:"name"`
+    Size        int64     `json:"size"`
+    ContentType string    `json:"content_type"`
+    CreatedAt   time.Time `json:"created_at"`
+    UpdatedAt   time.Time `json:"updated_at"`
+    URL         string    `json:"url"`
+}
+
+// Storage defines the interface for file storage operations
+type Storage interface {
+    // Save stores a file and returns its FileInfo
+    Save(ctx context.Context, name string, contentType string, reader io.Reader) (*FileInfo, error)
+
+    // Get retrieves a file by its ID
+    Get(ctx context.Context, id string) (io.ReadCloser, *FileInfo, error)
+
+    // Delete removes a file by its ID
+    Delete(ctx context.Context, id string) error
+
+    // List returns a list of files with optional prefix
+    List(ctx context.Context, prefix string, limit int, offset int) ([]*FileInfo, error)
+
+    // Exists checks if a file exists
+    Exists(ctx context.Context, id string) (bool, error)
+}