Build Contact Form backend module with email notifications

[yusuftomilola]

Description:
Create a full NestJS Contact module that handles contact form submissions end-to-end. This includes: a ContactMessage entity stored in PostgreSQL, a validated DTO, a public POST /contact endpoint with rate limiting (5 requests/minute), and two email notifications — a confirmation to the user and a notification to the admin.

Acceptance Criteria:

• ContactMessage entity with: fullName, email, phone (optional), company (optional), subject, message, ipAddress, isRead
• SubmitContactDto with class-validator decorators and @SanitizeString()
• POST /contact endpoint — public (@Public()), rate-limited (@Throttle)
• Saves submission to database
• Sends confirmation email to user (non-blocking)
• Sends notification email to admin with full message (non-blocking)
• Two Handlebars email templates: contact-confirmation.hbs and contact-notification.hbs
• sendContactConfirmation() and sendContactNotification() methods added to EmailService
• ContactModule registered in app.module.ts
• Rate limit config added to ThrottlerModule: { name: 'contact', ttl: 60_000, limit: 5 }

File(s): backend/src/contact/ (new module), backend/src/email/email.service.ts, backend/src/email/templates/contact-confirmation.hbs, backend/src/email/templates/contact-notification.hbs, backend/src/app.module.ts

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[AbdulmujibOladayo]

@AbdulmujibOladayo has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I am a fullstack software developer with multiple years experience in the industry. I can deliver on this issue in a few hours.

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This issue has been completed by @AbdulmujibOladayo as part of the Stellar Wave Program's 2nd Wave 🥳

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