feat: get_paper_meta_from_openalex 添加软停止

Co-authored-by: Copilot <copilot@github.com>

apps/resm/tasks.py

@@ -112,19 +112,20 @@ def get_paper_meta_from_openalex(publication_year:int, keywords:str="", search:s
                 papers.append(paper)
         Paper.objects.bulk_create(papers, ignore_conflicts=True)
     cache.set(cache_key, next_cursor, timeout=None)
-    if end_year is None:
-        end_year = datetime.now().year
-    if publication_year + 1 <= end_year:
-        current_app.send_task(
-            "apps.resm.tasks.get_paper_meta_from_openalex",
-            kwargs={
-                "publication_year": publication_year + 1,
-                "keywords": keywords,
-                "search": search,
-                "end_year": end_year
-            },
-            countdown=5
-        )
+    if cache.get("get_paper_meta_from_openalex_stop") is not None:
+        if end_year is None:
+            end_year = datetime.now().year
+        if publication_year + 1 <= end_year:
+            current_app.send_task(
+                "apps.resm.tasks.get_paper_meta_from_openalex",
+                kwargs={
+                    "publication_year": publication_year + 1,
+                    "keywords": keywords,
+                    "search": search,
+                    "end_year": end_year
+                },
+                countdown=5
+            )
 
 # 常用的 User-Agent 列表
 USER_AGENTS = [