M3a：息壤三级记忆域——归真触发提取管线/白名单明忆/重忆确认/正影版本链/删除墓碑/双通道召回注入，退役旧记忆-抽取-反思-大周天-演化管线（迁移 004，验收 7 用例）

backend/app/models/__init__.py

@@ -25,10 +25,10 @@ from app.models.mirror_tree import (
     TreeNode,
     TreeTransplant,
 )
-from app.models.memory import Memory, MemoryLink
 from app.models.personality import PersonalityProposal, PersonalityVersion
 from app.models.rbac import Permission, Role, RolePermission, UserRole
 from app.models.runtime import Event, Run
+from app.models.xirang import FactualRecord, Memory as XirangMemory, MemoryTrigger
 from app.models.safety import AuditEvent, PendingConfirmationRecord
 from app.models.skills import Skill
 from app.models.user import User
@@ -52,9 +52,7 @@ __all__ = [
     "Lorebook",
     "LorebookEntry",
     "McpServer",
-    "Memory",
     "MemoryCandidate",
-    "MemoryLink",
     "PendingConfirmationRecord",
     "PerceptionChannel",
     "Permission",