Add email and password login functionality to the management backend.
* **AuthController.java**
- Add a new endpoint `/mail-login` for email and password login.
- Use `@PostMapping` and `@Operation` annotations for the new endpoint.
- Call the `authService.mailLogin` method in the new endpoint.
* **AdminAuthService.java**
- Add a new method `AuthLoginRespVO mailLogin(AuthMailLoginReqVO reqVO)` to the interface.
* **AdminAuthServiceImpl.java**
- Implement the `mailLogin` method in the `AdminAuthServiceImpl` class.
- Authenticate the user using the email and password.
- Create a token after successful login and return the response.
* **AdminUserService.java**
- Add a method `AdminUserDO getUserByEmail(String email)` to the interface.
* **AdminUserServiceImpl.java**
- Implement the `getUserByEmail` method to fetch user details based on email.
* **AuthMailLoginReqVO.java**
- Create a new class `AuthMailLoginReqVO` for handling email and password login requests.
- Add fields `email` and `password` with appropriate validation annotations.
- Add a constructor, getters, and setters for the fields.
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