chore(stages): 🔧 Fix image loading reliability in pipeline by improving validation, error handling, and memory management

orchestrators/imajin-pipeline/src/image_pipeline/stages/image_loading.py

@@ -4,6 +4,8 @@ Decodes base64-encoded images, converts to PIL format, and resizes to target dim
 Executed before GenerateStage when init_image_base64 is provided in the request.
 """
 
+from __future__ import annotations
+
 import base64
 import io
 import logging