Add dynamic support email configuration

[heysamtexas]

Description

Allow admins to configure support contact email dynamically through Django admin interface.

Current State

Support email is likely hardcoded or missing from user-facing areas.

Proposed Implementation

Add field to SiteConfiguration model:

• support_email - EmailField for support contact
• show_support_contact - BooleanField to toggle display

Benefits

• Easy updates as team/organization changes
• Consistent support contact across application
• No code changes needed for contact updates

Use Cases

• Display in footer
• Show in error pages
• Include in help sections
• Auto-populate contact forms

Acceptance Criteria

• Add support email field to SiteConfiguration
• Display in footer and help areas
• Email format validation
• Optional: Support contact form integration
• Test email link functionality

Labels: enhancement, ui/ux, support
Priority: Low