feat(agent,report): 会话持久化与画像注入、报告反馈与预约留资——PM/开发双Agent迭代1-3

- agent: ag_conversation/ag_message 表(迁移0007),上下文组装注入最近报告画像摘要
  (report.profile.latest_profile_summary 经 apps 层闭包注入,同层不互调),历史带最近
  AGENT_HISTORY_TURNS=10 轮;POST/GET /agent/conversations 与消息历史接口
- agent 修复:ChatRequest.conversation_id 改 str(雪花ID超2^53,JS Number丢精度);
  _build_context 挪进 reserve commit 后同一 try,异常走 refund 兜底
- report: rp_feedback(维度反馈 upsert,认同率/修正率 SQL 可算,T-P3-21 最小版——
  L1 记忆未建,不回写结论)+ rp_reservation(预约留资幂等,T-P3-22,预约率口径
  行数/full_report.card_view 去重曝光,门槛≥8%),迁移0008
- 测试:全量 606 passed;ruff/mypy/lint-imports 全绿;E2E 真实 deepseek-v4-flash 验证
  画像注入与历史携带

packages/report/reservation_service.py

@@ -0,0 +1,43 @@
+"""预约留资服务（T-P3-22）。
+
+topic 预留通用性，首期只有 full_report（全面报告上线提醒）。
+幂等口径：UniqueConstraint(user_id, topic)——重复预约返回已有记录
+（created=false，HTTP 仍 200），绝不堆行。
+
+指标口径：预约率 = rp_reservation(topic='full_report') 行数 ÷ 埋点
+full_report.card_view 去重曝光数；决策门槛 ≥8%（产品方案 §2.2.3）。
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from packages.domain.ids import next_id
+from packages.report import repo
+from packages.shared.models import RpReservation
+
+
+@dataclass(frozen=True, slots=True)
+class ReservationResult:
+    reservation: RpReservation
+    created: bool  # false=幂等命中已有记录
+
+
+class ReservationService:
+    def __init__(self, session: AsyncSession) -> None:
+        self._session = session
+
+    async def reserve(self, *, user_id: int, topic: str) -> ReservationResult:
+        """幂等预约：同 user+topic 已存在即返回原记录。"""
+        existing = await repo.get_reservation(self._session, user_id=user_id, topic=topic)
+        if existing is not None:
+            return ReservationResult(reservation=existing, created=False)
+        row = RpReservation(reservation_id=next_id(), user_id=user_id, topic=topic)
+        self._session.add(row)
+        await self._session.flush()
+        return ReservationResult(reservation=row, created=True)
+
+    async def list_topics(self, *, user_id: int, topic: str | None = None) -> list[str]:
+        return await repo.list_reservation_topics(self._session, user_id=user_id, topic=topic)