feat: refactor summarizer and PDF extraction pipeline

- Split summarizer into summary_generator and summary_persister modules
- Refactor pdf_image_extractor to two-phase pipeline with PicoDet layout detection
- Add layout_detector service for PicoDet-S_layout_3cls integration
- Add exceptions module with ConflictError and NotFoundError
- Improve admin dashboard with better statistics and task management
- Add design review document with system optimization suggestions
- Add new tests for crawler, pdf_downloader, pipeline, and summary_utils
- Update dependencies and configuration
- Clean up dead code and improve error handling

tests/test_admin.py

@@ -67,7 +67,7 @@ class TestAdminAuth:
     def test_correct_session_accepted(self, auth_client):
         """已登录 session 应被接受（crawl 可能会失败但不是 303）。"""
         with patch(
-            "app.routes.admin.crawl_daily", new_callable=AsyncMock
+            "app.routes.admin.run_crawl", new_callable=AsyncMock
         ) as mock_crawl:
             mock_crawl.return_value = {"found": 0, "new": 0, "status": "success"}
             resp = auth_client.post("/admin/crawl")
@@ -83,9 +83,7 @@ class TestAdminAuth:
 
     def test_correct_session_batch_summarize(self, auth_client):
         """已登录调用 batch summarize，mock 掉服务层。"""
-        with patch(
-            "app.routes.admin.summarize_batch", new_callable=AsyncMock
-        ) as mock:
+        with patch("app.routes.admin.summarize_batch", new_callable=AsyncMock) as mock:
             mock.return_value = {
                 "status": "success",
                 "done": 0,
@@ -98,10 +96,12 @@ class TestAdminAuth:
 
     def test_single_paper_not_found(self, auth_client):
         """单篇总结不存在的论文返回 404。"""
+        from app.exceptions import NotFoundError
+
         with patch(
             "app.routes.admin.summarize_single",
             new_callable=AsyncMock,
-            return_value={"status": "not_found", "arxiv_id": "nonexistent.99999"},
+            side_effect=NotFoundError("Paper not found: nonexistent.99999"),
         ):
             resp = auth_client.post("/admin/summarize/nonexistent.99999")
             assert resp.status_code == 404
@@ -118,7 +118,7 @@ class TestAdminCrawl:
     def test_crawl_default_today(self, auth_client):
         """不指定日期时默认抓取今天。"""
         with patch(
-            "app.routes.admin.crawl_daily", new_callable=AsyncMock
+            "app.routes.admin.run_crawl", new_callable=AsyncMock
         ) as mock_crawl:
             mock_crawl.return_value = {"found": 5, "new": 3, "status": "success"}
             resp = auth_client.post("/admin/crawl")
@@ -130,7 +130,7 @@ class TestAdminCrawl:
     def test_crawl_specific_date(self, auth_client):
         """指定日期抓取。"""
         with patch(
-            "app.routes.admin.crawl_daily", new_callable=AsyncMock
+            "app.routes.admin.run_crawl", new_callable=AsyncMock
         ) as mock_crawl:
             mock_crawl.return_value = {"found": 2, "new": 1, "status": "success"}
             resp = auth_client.post("/admin/crawl?date=2024-01-15")
@@ -194,9 +194,7 @@ class TestAdminDelete:
         )
         assert resp.status_code == 422
 
-    def test_delete_with_confirm(
-        self, auth_client, db_session, sample_papers_range
-    ):
+    def test_delete_with_confirm(self, auth_client, db_session, sample_papers_range):
         """confirm='DELETE' 时应执行删除。"""
         resp = auth_client.post(
             "/admin/delete",
@@ -255,9 +253,7 @@ class TestAdminLogs:
         resp = client.get("/admin/logs", follow_redirects=False)
         assert resp.status_code == 303
 
-    def test_logs_contains_data(
-        self, auth_client, db_session, sample_papers_range
-    ):
+    def test_logs_contains_data(self, auth_client, db_session, sample_papers_range):
         """日志页面应包含日志数据。"""
         # 先创建一条日志
         now = utc_now()