[FEATURE] Add mock Resend email mode for local development

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Overview

Add a mock email mode so contributors can test email-related flows without needing a real Resend API key.

Problem

Email delivery is useful for notifications, onboarding, and future investor/driver updates. Contributors should be able to work on these flows without using maintainer credentials or sending real emails.

Expected solution

Add support for:

ENABLE_MOCK_EMAILS=true

When enabled:

• email sending should be skipped or written to a safe local console/log abstraction
• no real request should be sent to Resend
• mock output should include recipient, subject, and template name only where safe
• no sensitive tokens or personal secrets should be printed

Security notes

• Do not log secrets.
• Do not send real emails in tests.
• Avoid logging private user data beyond what is necessary for local debugging.

Files likely involved

• email service/helper files
• notification-related API routes
• .env.example
• README or contributor docs

Acceptance criteria

• ENABLE_MOCK_EMAILS=true disables real Resend API calls.
• Contributors can test email flows locally without a Resend key.
• Mock email behavior is documented.
• Production behavior remains unchanged when mock mode is disabled.
• Lint and build pass.

Suggested labels

email, backend, developer-experience, good first issue

Difficulty

Good first issue / Beginner

[Menjay7]

Hi! I came across this issue and would love to work on it. I have experience with similar tasks and I'm confident I can investigate, implement a clean solution, and thoroughly test it before submitting a PR. If the issue is still open, I would appreciate it if you could assign it to me. Thank you!

[Marvy247]

I've reviewed the issue description, and I'm confident I can implement all the requested details smoothly.​ Please assign this issue to me! I can have a PR ready for review in a few hours.
Thank You.

[githoboman]

hello would like to work on this

[jaynomyaro]

Hi! I’m a full-stack developer with a strong blockchain background. I’d love to handle this issue and can deliver a clean, reliable solution. Kindly assign it to me.

[Ekenesamuel8]

hello boss, please assign this task to me

[grantfox-oss]

🦊 GrantFox — @Ekenesamuel8 has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #25)
2. Your PR will be reviewed by the Chainmove maintainers

Good luck! Track your progress on GrantFox.