feat(image-render): gpt_image provider + media helper (SP image)

services/image-render/providers/_media.py

@@ -0,0 +1,18 @@
+"""b64 이미지 → NAS SMB 경로 저장 → /media/image URL 반환."""
+from __future__ import annotations
+
+import base64
+import os
+import uuid
+
+IMAGE_MEDIA_ROOT = os.getenv("IMAGE_MEDIA_ROOT", "/mnt/nas/webpage/data/image")
+IMAGE_MEDIA_URL_PREFIX = os.getenv("IMAGE_MEDIA_URL_PREFIX", "/media/image")
+
+
+def save_b64_png(task_id: str, b64_data: str) -> str:
+    os.makedirs(IMAGE_MEDIA_ROOT, exist_ok=True)
+    fname = f"{task_id}-{uuid.uuid4().hex[:8]}.png"
+    path = os.path.join(IMAGE_MEDIA_ROOT, fname)
+    with open(path, "wb") as f:
+        f.write(base64.b64decode(b64_data))
+    return f"{IMAGE_MEDIA_URL_PREFIX}/{fname}"