Add subscription Metadata to Subscription Details page

🔍 Problem Statement

Subscription metadata is not displayed on the Subscription Details page in the admin dashboard. Admins who have set metadata via the API must use API calls to view it, creating an unnecessary context switch.

💡 User Story

As a Pelcro admin, I want subscription metadata to be visible on the Subscription Details page, so that I can view custom data directly in the dashboard without making API calls.

🎯 Definition of Done (DoD)

A feature is done when:

✔️ Given a subscription with metadata, when an admin views the Subscription Details page, then all metadata key-value pairs are displayed in a dedicated section.