feat(classify): zero title-only titles, penalize <10min, add discover.candidate_min_score

标题仅含 require_title 不再计分（必须咻咻满+任一正向词）；时长 <10 分钟 -1（时长未知不扣）；新增 discover.candidate_min_score（默认=notify.min_score）控制是否进候选池，只过标题关的不再入池。库内 796 条：仅过标题关的 8 条从 1/3 分降为 0/-1，其余不变。

tests/test_discovery.py

@@ -35,6 +35,7 @@ def write_config(tmp, **discover):
             "keywords": ["咻咻满 reaction"],
             "pages": 1,
             "window_days": 14,
+            "candidate_min_score": 0,
             **discover,
         },
         "classify": {
@@ -91,8 +92,8 @@ def item(aid, *, title="咻咻满 reaction", up_mid=100, pubdate=NOW - 3600,
     )
 
 
-def make_service(tmp, items, *, notifier=None):
-    path = write_config(tmp)
+def make_service(tmp, items, *, notifier=None, **discover):
+    path = write_config(tmp, **discover)
     store = ConfigStore(path, env={})
     db = Database(Path(tmp) / "app.db", backup_dir=Path(tmp) / "backup")
     db.initialize()
@@ -128,9 +129,9 @@ def test_filters_and_scoring():
             assert summary.title_miss == 1
             assert summary.old == 1
             assert summary.blacklisted == 1
-            assert summary.candidates == 2  # aid 6（1 分）与 aid 2（2 分）
+            assert summary.candidates == 2  # aid 6（0 分）与 aid 2（2 分）
             assert summary.notified == 0
-            assert repo.get_candidate(6)["score"] == 1
+            assert repo.get_candidate(6)["score"] == 0  # 只过标题关：0 分
             assert repo.get_candidate(2)["score"] == 2  # reaction 命中后单个「切片」不再清零
             assert repo.get_candidate(4) is None
             assert repo.get_candidate(5) is None
@@ -217,12 +218,35 @@ def test_duplicate_search_results_notified_once():
             db.close()
 
 
+def test_candidate_min_score_floor():
+    with tempfile.TemporaryDirectory() as tmp:
+        db, repo, service = make_service(
+            tmp,
+            [
+                item(1, title="咻咻满 reaction 充电"),   # 9 分 -> 入池
+                item(2, title="咻咻满 日常"),            # 0 分 -> 只过标题关，不入池
+                item(3, title="咻咻满 reaction 切片"),   # 2 分 -> 低于候选线，不入池
+            ],
+            candidate_min_score=4,
+        )
+        try:
+            summary = service.run()
+            assert summary.scored == 3
+            assert summary.candidates == 1
+            assert repo.get_candidate(1) is not None
+            assert repo.get_candidate(2) is None
+            assert repo.get_candidate(3) is None
+        finally:
+            db.close()
+
+
 def main():
     test_filters_and_scoring()
     test_notification_batch_and_failure()
     test_search_error_does_not_abort_other_keywords()
     test_pending_candidate_notified_on_later_run()
     test_duplicate_search_results_notified_once()
+    test_candidate_min_score_floor()
     print("OK: 发现过滤、打分、候选池与通知批次测试全部通过")