- Move ES2 request/response types to es2_types.go
- Move profile operations (download, activate, deactivate, delete, status, list) to es2_operations.go
- Move helper methods (send requests, validation, generateRequestID) to es2_helpers.go
- Keep core ES2Service struct and ProvisionProfile in es2_client.go
- Revert sendDeactivationRequest parameter type from any back to interface{}
- Remove omitempty from Plan field in Subscriber model
- Update NotifySubscriberUpdate to use any instead of interface{}
- Update sendDeactivationRequest parameter type from interface{} to any
- Add os import for environment variable access
- Update getOperatorVariant to read OP from OPERATOR_VARIANT env var
- Add fallback to default "TelecomOP1234567" for development
- Add zero-padding for OP values shorter than 16 bytes
- Update comments to reference environment variable configuration
- Replace XOR-based OPc generation with AES-128 ECB encryption
- Add getOperatorVariant for consistent OP across subscribers
- Add AES cipher block creation with error handling
- Add OP length validation for AES-128 block size
- Update generateOPc to use crypto/aes for 3GPP-compliant OPc derivation
- Add hardcoded OP placeholder with production configuration note
- Add AMFClient and ES2Service dependencies to SubscriberService
- Initialize AMF client with default URL and ES2 service in NewSubscriberService
- Implement provisionESIMProfile with EID validation, profile provisioning, activation, and AMF notification
- Implement deactivateESIMProfile with profile deactivation, status updates, and session termination
- Add generateOPc helper for deriving OPc from OP and K using XOR-based
- Reformat struct field alignment for improved readability
- Add SubscriberStatusInactive to SubscriberStatus enum
- Add blank lines after type declarations for consistency
- Adjust whitespace and alignment across all model structs
- Add AMFClient struct with base URL and HTTP client
- Add NewAMFClient with 30s timeout
- Add TerminateSession for subscriber session termination with reason and timestamp
- Add NotifySubscriberUpdate for subscriber status change notifications
- Add SessionTerminationRequest and SessionTerminationResponse models
- Add generateRequestID helper for request tracking
- Add ES2Service struct with HTTP client and ES2Config
- Add NewES2Service with 30s timeout and TLS configuration
- Add ProvisionProfile for eSIM profile provisioning with metadata support
- Add ActivateProfile, DeactivateProfile, and DeleteProfile for profile lifecycle management
- Add GetProfileStatus for profile state queries
- Add ListProfiles for eUICC profile enumeration
- Add ValidateEID and ValidateICCID for identifier
- Add SubscriberService struct with Database and Config dependencies
- Add NewSubscriberService constructor
- Add CreateSubscriber with IMSI allocation, auth key generation, and eSIM provisioning support
- Add GetSubscriber and GetSubscriberByIMSI for subscriber retrieval
- Add UpdateSubscriber for subscriber information updates
- Add SuspendSubscriber with session termination
- Add TerminateSubscriber with session termination and eSIM profile deactivation
- Add ListSubscribers with pagination and
- Add Database struct with GORM PostgreSQL connection
- Add IMSIAllocation model for IMSI range tracking and allocation
- Add NewDatabase function with connection pooling (10 idle, 100 max connections, 1h lifetime)
- Add AutoMigrate for Subscriber, ServicePlan, Session, UsageRecord, and IMSIAllocation models
- Add InitializeIMSIAllocation with default IMSI range (1-999999999)
- Add CRUD operations for subscribers (Create, Get, GetByIMSI, Update, List)
- Add ListSubscribers with pagination, filtering by status/
- Add Config struct with server, database, Redis, IMSI, and ES2+ settings
- Add ServerConfig with port and timeout settings (30s read/write)
- Add DatabaseConfig for PostgreSQL connection parameters
- Add RedisConfig for cache connection settings
- Add IMSIConfig with France MCC+MNC prefix (20893) and IMSI range
- Add ES2Config for eSIM provisioning with SMDP connection parameters
- Add LoadConfig function with default configuration values
- Include JSON
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