Docs: Added comprehensive architectural decision log for Kasparro submission

Refactor: Aligned API routing with Kasparro spec and implement dynamic OAuth redirect URIs

Chore: Added deploy script and documentation

Feat: Implemented redis-backed rate limiting with fail-open and structured json logging

Feat: Implemented async summarise worker with upstash redis and automatic credit refund on job failure

Feat: Implemented synchronous /api/analyse endpoint and structured global error handling with request_ids

Feat: Completed strict Tier 1 requirements including domain-based routing, service layer extraction, and transaction history

Feat: Implemented derived credit ledger with idempotency keys for grants and deductions

Feat: Implemented Google OAuth authentication flow with JWT

Feat: Defined database schemas and configured async alembic migrations

Feat: Immplemented pydantic config loader and 503-aware database health check

Chore: Initialized FastAPI project structure and core dependencies