refactor: remove redundant samples() method

samples() duplicates N(), both setting the same field.
Keeping only N() simplifies the builder API and aligns with ImageOptions.

Signed-off-by: Jhzlo <kjh0010703@naver.com>

models/spring-ai-stability-ai/src/main/java/org/springframework/ai/stabilityai/api/StabilityAiImageOptions.java

@@ -485,11 +485,6 @@ public class StabilityAiImageOptions implements ImageOptions {
 			return this;
 		}
 
-		public Builder samples(Integer samples) {
-			this.options.setN(samples);
-			return this;
-		}
-
 		public Builder stylePreset(String stylePreset) {
 			this.options.setStylePreset(stylePreset);
 			return this;