feat: 完善周期报告与用户行为分析

- 支持可配置周报月报模板与登录后异步补生成\n- 增加用户行为埋点和后台分析页面\n- 移除主题额度并保留实修回顾结算\n- 修复历史会话续聊上下文丢失

ai_knowledge_base_v2/apps/backend/app/models/growth.py

@@ -131,7 +131,7 @@ class PeriodicReport(Base):
 
     id: Mapped[int] = mapped_column(PRIMARY_KEY_TYPE, primary_key=True, autoincrement=True)
     user_id: Mapped[int] = mapped_column(ForeignKey("sys_user.id"), index=True, nullable=False)
-    schema_version: Mapped[int] = mapped_column(Integer, default=2, nullable=False)
+    schema_version: Mapped[int] = mapped_column(Integer, default=3, nullable=False)
     report_type: Mapped[str] = mapped_column(String(30), nullable=False)
     period_start: Mapped[datetime] = mapped_column(DateTime, nullable=False)
     period_end: Mapped[datetime] = mapped_column(DateTime, nullable=False)
@@ -139,6 +139,8 @@ class PeriodicReport(Base):
     content: Mapped[str] = mapped_column(Text, default="", nullable=False)
     source_summary_ids: Mapped[str | None] = mapped_column(Text, nullable=True)
     source_topic_ids: Mapped[str | None] = mapped_column(Text, nullable=True)
+    source_message_ids: Mapped[str | None] = mapped_column(Text, nullable=True)
+    source_report_ids: Mapped[str | None] = mapped_column(Text, nullable=True)
     model_name: Mapped[str | None] = mapped_column(String(100), nullable=True)
     status: Mapped[str] = mapped_column(String(20), default="success", index=True, nullable=False)
     error_message: Mapped[str | None] = mapped_column(Text, nullable=True)