- 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 Subscriber model with IMSI, MSISDN, IMEI, and authentication fields - Add ServicePlan model with data/voice/SMS limits and QoS settings - Add Session model with PDU address, DNN, SNSSAI, and usage tracking - Add UsageRecord model for billing with usage type, volume, rate, and cost - Add SubscriberStatus enum (active, suspended, terminated, provisioning) - Add ProfileStatus enum for eSIM profile state tracking - Add SessionStatus enum (active, inactive, terminating) - Add UsageType enum (data, voice, sms) - Add PLMN struct with