docs: complete architecture specifications and project planning
Add comprehensive technical specifications for mockupAWS v0.2.0: - export/architecture.md: Complete system architecture with: * Layered architecture diagram (Client → API → Service → Repository → DB) * Full database schema with DDL SQL (5 tables, indexes, constraints) * API specifications (OpenAPI format) for all endpoints * Security architecture (auth, PII detection, rate limiting) * Data flow diagrams (ingestion, cost calculation, state machine) * Technology stack details (backend, frontend, infrastructure) * Project structure for backend and frontend * 4 Architecture Decision Records (DEC-001 to DEC-004) - export/kanban.md: Task breakdown with 32 tasks organized in: * Database setup (DB-001 to DB-007) * Backend models/schemas (BE-001 to BE-003) * Backend repositories (BE-004 to BE-008) * Backend services (BE-009 to BE-014) * Backend API (BE-015 to BE-020) * Testing (QA-001 to QA-003) - export/progress.md: Project tracking initialized with: * Current status: 0% complete, Fase 1 setup * Sprint planning and metrics * Resource links and team assignments All specifications follow 'Little Often' principle with tasks < 2 hours.
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