Issue: Replace String Status with Enum

[iRahmanG]

Problem

Right now subscription status in SubscriptionServiceImpl is stored as plain strings like "ACTIVE" and "CANCELLED".
Using strings is not safe because typos or inconsistent values can break the logic

Expected

We should use an enum SubscriptionStatus instead of strings
Example:

public enum SubscriptionStatus {
    ACTIVE,
    CANCELLED,
    EXPIRED
}

@rdodiya Kindly assign me this issue

[rdodiya]

Hi @iRahmanG ,

Instead of hardcoding status values in enums or service classes, store all status-related values in properties files and fetch them dynamically in both backend and frontend.

This approach will make status management more flexible and easier to maintain in future without code changes for every new status update.