feat(server): 完善 LLM 集成基础设施与规则配置

apps/server/services/event/__init__.py

@@ -1,14 +1,26 @@
-"""事件引擎子包 (MVP-1 / P1-P2 / P5)。
+"""事件引擎子包 (MVP-1 / P1-P2 / P5 + MVP-3 / D26-D28)。
 
 模块结构::
 
     decision_engine.py    决策引擎 (置信度评估 + 事件类型映射)
     rule_engine.py        规则引擎 (YAML 驱动)
     aggregator.py         事件聚合器 (时间窗口去重)
+    frame_accumulator.py  多帧累积分析器 (MVP-3)
+    llm_trigger.py        LLM 触发决策器 (MVP-3)
 """
 
-from .decision_engine import EventDecisionEngine
-from .rule_engine import AlertRuleEngine
 from .aggregator import EventAggregator
+from .decision_engine import EventDecisionEngine
+from .frame_accumulator import AccumulationEntry, MultiFrameAccumulator
+from .llm_trigger import LLMTrigger, TriggerDecision
+from .rule_engine import AlertRuleEngine
 
-__all__ = ["EventDecisionEngine", "AlertRuleEngine", "EventAggregator"]
+__all__ = [
+    "EventDecisionEngine",
+    "AlertRuleEngine",
+    "EventAggregator",
+    "MultiFrameAccumulator",
+    "AccumulationEntry",
+    "LLMTrigger",
+    "TriggerDecision",
+]