docs: add v0.5.0 kickoff prompt with complete task breakdown
Add comprehensive prompt for v0.5.0 implementation including:
- JWT Authentication (register, login, refresh, reset password)
- API Keys Management (generate, validate, revoke)
- Report Scheduling (cron jobs, daily/weekly/monthly)
- Email Notifications (SendGrid/AWS SES)
- Advanced Filters (date, cost, region, status)
- Export Comparison as PDF
Task assignments for all 6 team members:
- @db-engineer: 3 database migrations
- @backend-dev: 8 backend services and APIs
- @frontend-dev: 7 frontend pages and components
- @devops-engineer: 3 infrastructure configs
- @qa-engineer: 4 test suites
- @spec-architect: 2 architecture and docs tasks
Timeline: 3 weeks with clear dependencies and milestones.
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