fix: use bucket system for inference resolution to prevent content cropping, then resize back to original

app.py

@@ -386,9 +386,9 @@ def prepare_images_before_pipe(
 
     base_w, base_h = pil_images[0].size
 
-    # 保持原始尺寸，只对齐到 divisible_by（对齐 Rebels.json divisible_by=2）
-    target_w = max(divisible_by, (base_w // divisible_by) * divisible_by)
-    target_h = max(divisible_by, (base_h // divisible_by) * divisible_by)
+    # 用 bucket 系统选择最佳推理分辨率（~1MP），匹配模型训练分辨率
+    # 避免原图分辨率过大/过小导致内容偏移或裁剪
+    target_w, target_h = pick_best_bucket(base_w, base_h, SAFE_BUCKETS, allow_upscale)
 
     processed = []
     for img in pil_images: