feat(classify): gate loose re token, non-linear negatives, drop 纯享/转场

reaction 词表用 re|reaction|反应 但须与咻咻满或充电同现，兼容 reactio/reation 等拼写又避免通用词加分；负向改为每词 -2 且命中多条额外叠加（k*(k-1)），日期 -4；纯享（误伤纯享受）移出负向，转场移出正向。库内 796 条有效视频复测：线以下由 14 降至 8。

reaction_board/config.py

@@ -25,10 +25,10 @@ from .client_ip import (
 DEFAULT_CLASSIFY: dict[str, Any] = {
     "require_title": "咻咻满",
     "self_mid": 37754047,
-    "reaction": ["reaction", "反应"],
-    "charge": ["加急", "特急", "充电", "专场", "转场"],
+    "reaction": ["re", "reaction", "反应"],
+    "charge": ["加急", "特急", "充电", "专场"],
     "weak_positive": ["双人", "路人", "第一次", "首次"],
-    "negative": ["歌切", "切片", "纯享", "搬运", "完整版", "录播", "录像"],
+    "negative": ["歌切", "切片", "搬运", "完整版", "录播", "录像"],
     "date_negative": True,
     "duration_boost": {"gt_30min": 1, "gt_60min": 2},
 }