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/provider/comfyui/client.go

@@ -146,8 +146,16 @@ func (c *Client) DownloadView(ctx context.Context, filename, subfolder, imageTyp
 }
 
 func (c *Client) UploadImage(ctx context.Context, data []byte, filename string) (string, error) {
+	if len(data) == 0 {
+		return "", fmt.Errorf("empty image payload")
+	}
+	if strings.TrimSpace(filename) == "" {
+		filename = "input.png"
+	}
 	var buf bytes.Buffer
 	w := multipart.NewWriter(&buf)
+	_ = w.WriteField("type", "input")
+	_ = w.WriteField("overwrite", "true")
 	part, err := w.CreateFormFile("image", filename)
 	if err != nil {
 		return "", err
@@ -155,8 +163,9 @@ func (c *Client) UploadImage(ctx context.Context, data []byte, filename string)
 	if _, err := part.Write(data); err != nil {
 		return "", err
 	}
-	_ = w.WriteField("overwrite", "true")
-	_ = w.Close()
+	if err := w.Close(); err != nil {
+		return "", err
+	}
 	req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.BaseURL+"/upload/image", &buf)
 	if err != nil {
 		return "", err