- Replace interface{} with any in api_integration_test.go makeRequest method and test response maps
- Replace interface{} with any in logging.go WithField method and all logging function signatures
- Replace interface{} with any in middleware etag.go sync.Map.Range callback
- Replace interface{} with any in middleware redis_ratelimit.go RedisClientInterface and result parsing
- Replace interface{} with any in middleware redis_ratelimit_
- Add ChargingHandler struct with ChargingEngineClient dependency
- Add NewChargingHandler constructor
- Add CheckCredit endpoint to validate sufficient credit for requested bytes
- Add GetBalance endpoint to retrieve current balance for an IP
- Add AddCredit endpoint to add bytes to an IP's credit
- Add DeductCredit endpoint to deduct bytes from an IP's credit
- Add IP parameter validation and JSON request binding
- Add TestSetup struct with DB/Router/AuthService/test users/JWT tokens for test environment initialization
- Add setupTest function with SQLite in-memory database, user/plugin/automation/config/auth session migrations, and test user creation with admin/operator/viewer/user roles
- Add makeRequest helper for authenticated HTTP requests with Bearer token and JSON body support
- Add ServicesHandler with List/Get/Restart/Start/Stop/Scale/Logs/Health/PodStatus/Events methods and Kubernetes service integration
- Add MonitoringHandler with Metrics/Alerts/Health/Logs methods and Prometheus service integration
- Add DeploymentsHandler with Status/Start/Rollback/History methods and deployment service integration
- Add PluginsHandler with List
- Replace map[string]interface{} with map[string]any in GraphQL, metrics, payment gateway, and webhook handlers
- Replace []byte(fmt.Sprintf()) with fmt.Appendf(nil, ...) for cursor encoding in GraphQL resolvers and tests
- Replace strings.HasPrefix/TrimPrefix with strings.CutPrefix for webhook signature parsing
- Replace stripe.Int64/Bool with new() constructor for Stripe payment parameters
- Rename Error
- Add AuthHandler struct with authService dependency and NewAuthHandler constructor
- Add LoginRequest/LoginResponse/RegisterRequest/ChangePasswordRequest structs with validation tags
- Add Login method with username/password validation, token generation, and user response
- Add Register method with email/password/role validation and user creation
- Add RefreshToken method with JWT refresh token validation
- Add error code constants for validation/auth/resource/system/business logic errors (VALIDATION_FAILED/UNAUTHORIZED/NOT_FOUND/INTERNAL_ERROR/etc)
- Add EnhancedErrorResponse with error/code/details/context/timestamp/request_id fields and ValidationErrorResponse with field-specific errors array
- Add handleError function with gorm.ErrRecordNotFound/ErrDuplicatedKey/ErrInvalidData handling
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