feat(classify): tighten scoring with reaction co-occurrence and date negatives

强正向 reaction 需标题同时含 require_title；移除听/看等宽泛词，新增弱正向组；charge 命中>=2 记+3、==1 记+1；负向补充录播/录像并新增标题带日期强负向；时长仅在已命中 reaction/charge 时加权；discover 关键词改为单个咻咻满、pages=3、window_days=7，notify.min_score=4；同步示例配置、project.md/README 与相关测试。

tests/test_discovery.py

@@ -40,12 +40,14 @@ def write_config(tmp, **discover):
         "classify": {
             "require_title": "咻咻满",
             "self_mid": 37754047,
-            "positive": ["reaction"],
+            "reaction": ["reaction"],
             "charge": ["充电"],
+            "weak_positive": [],
             "negative": ["切片"],
+            "date_negative": True,
             "duration_boost": {"gt_30min": 1, "gt_60min": 2},
         },
-        "notify": {"min_score": 2, "max_items_per_message": 10},
+        "notify": {"min_score": 3, "max_items_per_message": 10},
     }
     path = Path(tmp) / "config.json"
     path.write_text(json.dumps(data, ensure_ascii=False), encoding="utf-8")