nutcas3 f10d180bf4 feat: Add charging engine with Redis-based credit management and usage tracking ...

- Add ChargingEngine struct with Redis client, rating plans, and sync interval
- Add SubscriberAccount model with balance, data/voice/SMS limits and usage tracking
- Add UsageEvent model for billing events with cost calculation
- Add RatingPlan model with data/voice/SMS rates and limits
- Add AccountStatus enum (Active, Suspended, Terminated, Blocked)
- Add UsageType enum (Data, Voice, SMS)
- Add sync_usage_data for

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..

src

feat: Add charging engine with Redis-based credit management and usage tracking

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.env.example

feat: Initialize telecom platform with core services and infrastructure

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Cargo.toml

feat: Initialize telecom platform with core services and infrastructure

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