Split ingress keys into text/image protocols with Replicate model listing.

Add model input defaults (including prompt), workflow model editing, ingress API docs, and fix img2img image upload filenames for signed URLs.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/storage/imagestore/store.go

@@ -74,6 +74,18 @@ func (s *Store) Get(id string) (*model.StoredImage, error) {
 	return &img, nil
 }
 
+func (s *Store) ReadContent(id string) ([]byte, *model.StoredImage, error) {
+	img, err := s.Get(id)
+	if err != nil {
+		return nil, nil, err
+	}
+	data, err := os.ReadFile(img.LocalPath)
+	if err != nil {
+		return nil, nil, err
+	}
+	return data, img, nil
+}
+
 func (s *Store) ListByPrediction(predictionID string) ([]model.StoredImage, error) {
 	var imgs []model.StoredImage
 	err := s.db.Where("prediction_id = ?", predictionID).Order("created_at asc").Find(&imgs).Error