生成的密碼哈希:
Email: admin@example.com
Password: admin123
Hash: $2y$10$nvdl6Zz1sNdV0VRr8oxpyu.3kxo304JIZItmTIi2rBge9vXSigPei

Email: teacher@example.com
Password: teacher123
Hash: $2y$10$nl9mc10HzDtbD9ujRdjoIe4iLVgZ29ufiS2tzFarR85VeNyVGLq5e

Email: student@example.com
Password: student123
Hash: $2y$10$HtBZF/hdNlppmgl8jCREfe9HcbOVljRsgmPN.qgkPfPW84F7lDZ.a