feat(emotion): A1 情绪系统接线 + refactor: 拆分 channelbridge.go

A1 情绪接线:
- loop 回合边界钩子(TurnEnd/OnTurnEnd/settleTurn, Result.Mood); 每轮一次非每步
- persona/emotion: React(valence五档) + Machine.Move(BFS最短合法路径一步) + Observer(observe/decay/好感度,仅变化才emit); 好感度步长读角色配置(cyrene delta=10, 0..700)
- 落库 Mood(web session_persist.res.Mood + IM channelbridge/persist; user消息不带mood); WS mood事件(BroadcastMood,仅变化); per-persona隔离; 群聊/陌生人只读不写不发
- cmd/cyrene/emotion.go 生产接线 + wire.go 注入 loop.Options.OnTurnEnd
- 22 测试(状态机被loop调用/Mood非空落库/mood帧shape/只变化才发/群聊只读) + 真二进制冒烟
- Docs: api-client v0.32 §3.7 情绪事件 + 开源对照清单(companion 应用对照)
- 诚实: 本机无LLM凭据→未活体验证'模型返回后完整轮次'一环

拆分 channelbridge.go 816→257(纯搬移零逻辑): connect/inbound/outbound/blacklist/helpers.go; A1 的 IM mood 调用点落在新 inbound.go, 故与本提交同批

回滚 6 个 gofmt 顺手格式化文件(capacity_loop_test/flow/source_test/findchannel_test/admin_channels_platform_test/history) 缩 diff, 含 history.go 注释被转弯引号

internal/services/gateway/server.go

@@ -681,6 +681,30 @@ func (s *Server) BroadcastCapacityAwaken(sessionID, fromState, toState, tool str
 	})
 }
 
+// wsMoodEvent is the WS event type carrying the persona's mood after a turn
+// (design/07 §3 下行 `mood`; design/01 §2 情绪状态机). The frontend's existing
+// `mood` handler (ws.ts) reads data.mood and shows the 心情 badge.
+const wsMoodEvent = "mood"
+
+// BroadcastMood fans one emotion change to every Web client as a `mood` frame
+// (design/07 §3). It is called only when the mood actually changed — the
+// machinery in the composition root is the gate — so the badge does not flicker
+// with an unchanged value on every turn. data matches what the frontend `mood`
+// handler reads ({mood}); affection/personaId ride along as the honest extra
+// detail (affection is the persona's current 好感度, personaId the persona whose
+// mood moved) and are ignored by clients that do not render them. The mood is a
+// persona-level value, not a per-session one, so no sessionId is attached.
+func (s *Server) BroadcastMood(personaID, mood string, affection int) {
+	s.hub.broadcast(wsEvent{
+		Type: wsMoodEvent,
+		Data: map[string]any{
+			"mood":      mood,
+			"personaId": personaID,
+			"affection": affection,
+		},
+	})
+}
+
 // sourcedLog returns a logger tagged with source "gateway", substituting a
 // discard logger for nil so Server can always log safely.
 func sourcedLog(l *slog.Logger) *slog.Logger {