Add DEVELOPER_FOLLOWUP_ROADMAP.md with actionable engineering tasks

[Copilot]

Created developer-focused roadmap that decomposes high-level strategic goals from ROADMAP.md into concrete, implementable tasks with technical specifications.

Document Structure

• Immediate Action Items (Phase 1) - Remaining 5% to complete: security audit workflow, API Gateway implementation, Docker/K8s/CI-CD setup, monitoring stack, missing frontend screens
• Phase 2 Technical Specs - DeFi contracts (staking, AMM, farming), referral system, NFT marketplace, i18n implementation with code examples and function signatures
• Technical Debt - Code quality checklist, security hardening (reentrancy guards, rate limiting, secrets management), gas and performance optimization strategies
• Infrastructure - Database scaling (replication, sharding), K8s migration, CDN integration
• Testing Framework - Smart contract unit/integration tests, backend load testing, frontend E2E flows with coverage targets
• Documentation Matrix - API specs (Swagger), architecture diagrams, deployment runbooks, disaster recovery procedures
• Developer Experience - Onboarding checklist, sprint planning template, KPI tracking, escalation paths

Key Additions

Provides concrete artifacts developers can pick up immediately:

• Smart contract function signatures and gas optimization notes
• API endpoint definitions with request/response schemas
• File paths for new components (/server/routes/api.js, /contracts/ZeaStaking.sol)
• Testing coverage targets and tool recommendations
• CI/CD workflow configurations (GitHub Actions YAML structure)

Bridges gap between "what to build" (ROADMAP.md) and "how to build it" with implementation-ready specifications.

Original prompt

DEVLEOPER FOLLOWUP ROADMAP.md

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