Fix: Import DiffusionPipelineManager and PostProcessor correctly

app.py

@@ -13,9 +13,9 @@ import sys
 # Add backend to path
 sys.path.insert(0, str(Path(__file__).parent))
 
-from backend.services.diffusion_pipeline import DiffusionPipeline
+from backend.services.diffusion_pipeline import DiffusionPipelineManager
 from backend.services.upscaler import ESRGANUpscaler
-from backend.services.post_processor import PostProcessor
+from backend.services.postprocess import PostProcessor
 from backend.config import settings
 
 # Configure logging
@@ -33,7 +33,7 @@ def initialize_models():
     
     if diffusion_pipeline is None:
         logger.info("Loading Stable Diffusion pipeline...")
-        diffusion_pipeline = DiffusionPipeline()
+        diffusion_pipeline = DiffusionPipelineManager()
         
     if upscaler is None:
         logger.info("Loading upscaler...")