feat(crm): implement unified contact form system
Complete CRM foundation with contact modal in footer
Backend:
- Contact.model.js: Full CRUD model with statistics tracking
- contact.controller.js: Submit, list, assign, respond, update, delete
- contact.routes.js: Public submission + admin management endpoints
- routes/index.js: Mount contact routes at /api/contact
Frontend:
- footer.js: Replace mailto link with Contact Us modal button
- Contact modal: Form with type, name, email, org, subject, message
- CSRF protection: Extracts token from cookie (like newsletter)
- Rate limiting: formRateLimiter (5/min)
- Validation: Input sanitization + required fields
- UX: Success/error messages, auto-close on success
Admin UI:
- navbar-admin.js: New 'CRM & Communications' section
- Links: Contact Management, Case Submissions, Media Inquiries
Foundation for multi-project CRM across tractatus, family-history, sydigital
Next: Build /admin/contact-management.html page
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