- Add Link struct with href, rel, and optional type fields
- Add Links map type for HATEOAS link collections
- Add SubscriberWithLinks and SubscriberListWithLinks wrapper types
- Add NewSubscriberLinks function generating self, update, delete, billing, and sessions links
- Add NewSubscriberListLinks function with self, create, and conditional next pagination links
- Add User struct with username/email/password/first_name/last_name/role/is_active/last_login fields and GORM tags
- Add Role struct with name/description/permissions many2many relationship and GORM tags
- Add Permission struct with name/resource/action/description fields for RBAC
- Add AuthSession struct with user_id/token/refresh_token/expires_at/ip_address/user_agent/is_active fields
- Add APIKey struct with name
- Add Balance float64 field to Subscriber struct with JSON and GORM tags
- Set default value to 0 in database schema
- Align PlanID and Status field formatting
- Add SubscriberAccount with balance, usage limits (data/voice/SMS), and status tracking
- Add UsageEvent for tracking usage sessions with volume, rate, and cost
- Add Invoice with line items and status (DRAFT, PENDING, PAID, OVERDUE, CANCELLED)
- Add RatingPlan with rate definitions for data/voice/SMS and monthly fees
- Add Alert with types (LOW_BALANCE, HIGH_USAGE, PAYMENT_FAILED, SYSTEM_ERROR) and severity levels
- Add Pay
- Remove omitempty from Plan field in Subscriber model
- Update NotifySubscriberUpdate to use any instead of interface{}
- Update sendDeactivationRequest parameter type from interface{} to any
- 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
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