feat(economics): add Phase 12 - Economics & Billing infrastructure
Complete economics service implementation with:
- Price Oracle with TWAP (Time-Weighted Average Price)
- Multi-source price aggregation
- Configurable staleness thresholds
- Exponential, SMA, and standard TWAP strategies
- Metering Service for L2 usage tracking
- Storage: GB-months, retrieval bandwidth
- Hosting: bandwidth, custom domains
- Database: queries, vector searches
- Compute: CPU core-hours, GPU hours, memory
- Network: bandwidth, requests
- Billing Engine
- Invoice generation with line items
- Payment processing (crypto/fiat)
- Credit management with expiration
- Auto-pay from prepaid balance
- Pricing Tiers: Free, Standard, Premium, Enterprise
- 0%, 10%, 20%, 30% usage discounts
- SLA guarantees: 95%, 99%, 99.9%, 99.99%
- Cost Calculator & Estimator
- Usage projections
- Tier comparison recommendations
- ROI analysis
- Docker deployment with PostgreSQL schema
All 61 tests passing.
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