Adolfo Delorenzo 4cbf192fa5 feat(03-01): backend API endpoints — channels, billing, usage, and audit logger enhancement ...

- Create channels.py: HMAC-signed OAuth state generation/verification, Slack OAuth install/callback, WhatsApp manual connect, test message endpoint
- Create billing.py: Stripe Checkout session, billing portal session, webhook handler with idempotency (StripeEvent table), subscription lifecycle management
- Update usage.py: add _aggregate_rows_by_agent and _aggregate_rows_by_provider helpers (unit-testable without DB), complete usage endpoints
- Fix audit.py: rename 'metadata' attribute to 'event_metadata' (SQLAlchemy 2.0 DeclarativeBase reserves 'metadata')
- Enhance runner.py: audit log now includes prompt_tokens, completion_tokens, total_tokens, cost_usd, provider in LLM call metadata
- Update api/__init__.py to export all new routers
- All 27 unit tests passing

2026-03-23 21:24:08 -06:00

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