Add unit tests for player configurations and referral system

- Implement tests for player configuration creation, update, and deletion, ensuring proper handling of free and paid user scenarios.
- Add tests for referral registration, including valid and invalid referrer cases.
- Create tests for referral reward flow, verifying correct reward distribution and eligibility.
- Establish a test database setup with necessary schema for user, plan, payment, and notification models.
- Introduce helper functions for seeding test data and loading entities from the database.

pkg/token/interface.go

@@ -1,26 +0,0 @@
-package token
-
-// TokenPair contains the access and refresh tokens
-type TokenPair struct {
-	AccessToken  string
-	RefreshToken string
-	AccessUUID   string
-	RefreshUUID  string
-	AtExpires    int64
-	RtExpires    int64
-}
-
-// Claims defines the JWT claims (User)
-type Claims struct {
-	UserID  string `json:"user_id"`
-	Email   string `json:"email"`
-	Role    string `json:"role"`
-	TokenID string `json:"token_id"`
-}
-
-// Provider defines the interface for token operations
-type Provider interface {
-	GenerateTokenPair(userID, email, role string) (*TokenPair, error)
-	ParseToken(tokenString string) (*Claims, error)
-	ParseMapToken(tokenString string) (map[string]interface{}, error)
-}