chore: initialize medical consultation agent demo

backend/app/repositories/profile_repository.py

@@ -0,0 +1,25 @@
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.models.user import UserLearningProfile
+
+
+class UserLearningProfileRepository:
+    """学习档案仓储：维护用户训练评价聚合数据。"""
+
+    def __init__(self, db: Session) -> None:
+        self.db = db
+
+    def get_profile(self, user_id: str, tenant_id: str | None) -> UserLearningProfile | None:
+        """档案读取：按 user_id 和 tenant_id 获取学习档案。"""
+        stmt = select(UserLearningProfile).where(
+            UserLearningProfile.user_id == user_id,
+            UserLearningProfile.tenant_id == tenant_id,
+        )
+        return self.db.scalar(stmt)
+
+    def save(self, profile: UserLearningProfile) -> UserLearningProfile:
+        """档案保存：创建或更新用户学习档案。"""
+        self.db.add(profile)
+        self.db.flush()
+        return profile