fix: panic in subscribe logic when token is invalid or user not found #105
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This PR fixes a panic: runtime error: invalid memory address or nil pointer dereference that occurs in subscribeLogic.go. Reason: When getUserSubscribe is called with an invalid or expired token, UserModel.FindOneSubscribeByToken returns a nil userSub without an error. Accessing userSub.SubscribeId in the subsequent code causes a panic (HTTP 500). Fix: Added a nil check for userSub before returning it.