🔗 Allow admins to create referral programs

[YodaLightsabr]

Summary of the problem

Referral::Programs can only be created by having the engineering team open up the HCB console and create a program from there—there's too much friction here, and it makes it harder for our team to quickly iterate.

Describe your changes

Allow any admin to create a referral program

[Copilot]

Pull Request Overview

This PR enables administrators to create referral programs through the admin interface, removing the dependency on engineering team console access. Previously, referral programs could only be created by engineers directly through the console, creating unnecessary friction for the team.

• Added new admin routes and controller methods for viewing and creating referral programs
• Created an admin interface for managing referral programs with creation form
• Added referral program filtering to the admin users view

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
config/routes.rb	Adds new admin routes for referral program management
app/views/layouts/admin.html.erb	Adds referral programs navigation link with counter
app/views/admin/users.html.erb	Adds referral program filter dropdown to user search
app/views/admin/referral_programs.html.erb	Creates new admin interface for viewing and creating referral programs
app/controllers/admin_controller.rb	Implements controller methods for referral program CRUD operations

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