M-AI-04 Active Recall 端到端迁移

将现有 Active Recall AI 分析链路从旧 ai-analysis 执行路径迁移到 M-AI-03 统一 Job Engine。

入口: POST /api/active-recalls/:id/submit → ActiveRecallService → AiJobCreationService → AiJob + Snapshot + Outbox → Outbox Dispatcher → ai-interactive → AiJobExecutionEngine → ActiveRecall Executor → Validation → ActiveRecall Projector → 业务结果 + Artifact

核心约束: HTTP 接口不变、统一 Job 创建、Feature Flag 灰度、Snapshot 不可变、Projector 原子幂等、旧链路保留

非目标: Feynman/Quiz/ReviewCard 迁移、数据库 Migration、Heavy Runtime 下线、客户端 UI 重构

完成标准: 原接口兼容、Unified 模式端到端通过、Legacy/Unified 可配置切换、M-AI-04-GATE PASS

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