Initial commit: secondary school grade archive system.

Add FastAPI/React app with Docker deployment, Ubuntu one-click install, and docs for junior/senior high score tracking and mistake bank.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/services/student_access.py

@@ -0,0 +1,13 @@
+import uuid
+
+from fastapi import HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.models.user import Student
+
+
+def get_student_for_user(db: Session, student_id: uuid.UUID, user_id: uuid.UUID) -> Student:
+    student = db.get(Student, student_id)
+    if student is None or student.user_id != user_id:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="学生不存在")
+    return student