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_config.py

@@ -54,9 +54,11 @@ def test_dual_accounts_and_env_override():
         assert (cfg.bilibili.write.mid, cfg.bilibili.write.csrf, cfg.bilibili.write.cookie) == (202, "env-write", "env-write-cookie")
         assert cfg.storage.database_path == Path(tmp) / "custom.db"
         assert cfg.up_blacklist_seed == (1, 2)
-        assert cfg.discover.keywords == ("咻咻满 reaction", "咻咻满 充电")
-        assert cfg.discover.pages == 2
+        assert cfg.discover.keywords == ("咻咻满",)
+        assert cfg.discover.pages == 3
         assert cfg.classify["self_mid"] == 37754047
+        assert cfg.classify["reaction"] == ["reaction", "反应"]
+        assert cfg.classify["date_negative"] is True
 
 
 def test_flat_and_missing_account_rejected():