feat(images): review and apply Delete images as a reviewed plan job (#480)

POST /prompt_manager/images/delete/preview reviews both modes; the
maintenance apply takes {token, mode}. Library mode removes the records and
writes the removal mark; trash mode moves the file first and removes its
records only after a successful move. The workspace listing, the output scan,
the duplicate find and Tag output images skip marked files.

py/api/admin.py

@@ -883,6 +883,8 @@ class AdminRoutesMixin:
         extensions = IMAGE_EXTENSIONS + VIDEO_EXTENSIONS
         media_files = []
         seen = set()
+        # #480: a file removed from the library is never a copy or a keeper.
+        marks = self.db.removal_marks()
         for slot, root in enumerate(roots):
             for path in _collect_media_files([root], extensions):
                 try:
@@ -891,6 +893,12 @@ class AdminRoutesMixin:
                     stat = os.stat(path)
                 except OSError:
                     continue
+                mark = marks.get(os.path.normcase(os.path.realpath(str(path))))
+                if mark is not None and tuple(mark) == (
+                    stat.st_size,
+                    stat.st_mtime_ns,
+                ):
+                    continue
                 key = _physical_file_key(path, stat)
                 if key not in seen:
                     seen.add(key)
@@ -1551,8 +1559,13 @@ class AdminRoutesMixin:
             if job.cancelled:
                 return
             batch = media_files[batch_start : batch_start + SCAN_BATCH_SIZE]
-            skipped = [f for f in batch if str(f) in known]
-            to_read = [f for f in batch if str(f) not in known]
+            # #480: a file removed from the library is not read or linked
+            # again while its bytes are unchanged.
+            removed = await self._run_in_executor(self._removed_paths, batch)
+            skipped = [f for f in batch if str(f) in known or str(f) in removed]
+            to_read = [
+                f for f in batch if str(f) not in known and str(f) not in removed
+            ]
             outcomes = [_scan_outcome(f, roots, "skipped") for f in skipped]
             counts["processed"] += len(skipped)
             counts["unchanged"] += len(skipped)