fix: change error define

[lwnmengjing]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• Test A
• Test B

Test Configuration:

• Firmware version:
• Hardware:
• Toolchain:
• SDK:

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[Copilot]

Pull Request Overview

This PR refactors error handling in the email sending process by replacing inline error creation with a constant error variable and adds initialization for missing Department and Post structs within the user info function.

• Introduces a singular error variable to standardize error responses for unsupported email operations.
• Replaces multiple inline error creations with the new error variable.
• Adds logic to initialize Department and Post objects if missing in the UserInfo function.

Comments suppressed due to low confidence (1)

apis/user.go:37

• [nitpick] Consider revising the error message for clarity, e.g., 'email sending not supported', to improve readability and comprehension.

errNotSupportEmail = errors.New("not support send email")

[github-actions]

Field	Coverage
total:	4.0%

[github-actions]

Field	Coverage
total:	4.0%