fix: stabilize Shopee cover replacement

app/image_paths.py

@@ -0,0 +1,48 @@
+import os
+
+from .config import make_slug
+
+
+def task_image_path(image_root, task, account=None, suffix="old", ext=".jpg"):
+    batch_id = _safe_component(_get(task, "batch_id"), "unknown_batch")
+    slug = _account_slug(account, task)
+    task_id = _safe_component(_get(task, "id"), "task")
+    item_id = _safe_component(_get(task, "item_id"), "item")
+    suffix = _safe_component(suffix, "image")
+    ext = str(ext or ".jpg")
+    if not ext.startswith("."):
+        ext = "." + ext
+    return os.path.abspath(
+        os.path.join(
+            str(image_root or "images"),
+            batch_id,
+            slug,
+            f"{task_id}_{item_id}_{suffix}{ext}",
+        )
+    )
+
+
+def _account_slug(account, task):
+    slug = _get(account, "slug")
+    if slug:
+        return _safe_component(slug, "unknown_account")
+    alias = _get(task, "alias") or _get(account, "alias") or _get(task, "account_name") or _get(account, "account_name")
+    if alias:
+        return _safe_component(make_slug(alias), "unknown_account")
+    return "unknown_account"
+
+
+def _get(obj, name, default=None):
+    if obj is None:
+        return default
+    if isinstance(obj, dict):
+        return obj.get(name, default)
+    return getattr(obj, name, default)
+
+
+def _safe_component(value, default):
+    text = str(value or "").strip()
+    if not text:
+        text = str(default)
+    safe = "".join(ch if ch.isalnum() or ch in "_-" else "_" for ch in text).strip("_")
+    return safe or str(default)