Admin fixes, minio texts removed, added is_active to User model

backend/main.py

@@ -307,6 +307,16 @@ def bulk_delete_students(payload: DeleteUsersRequest, session: Session = Depends
     session.commit()
     return {"success": True}
 
+@app.put("/api/admin/students/{user_id}/toggle", tags=["Admin"])
+def toggle_student_active(user_id: UUID, session: Session = Depends(get_session)):
+    user = session.get(models.User, user_id)
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    user.is_active = not getattr(user, 'is_active', True)
+    session.add(user)
+    session.commit()
+    return {"success": True, "is_active": user.is_active}
+
 @app.post("/api/auth/register", tags=["Authentication"])
 def register(payload: RegisterPayload, session: Session = Depends(get_session)):
     import bcrypt