feat: Nexus 6.0 6-step implementation (Step 0-5)
Step 0: Infrastructure hardening — Redis BlockingConnectionPool,
WebSocket two-layer (memory+Redis Pub/Sub), JWT auth, DB session leak fix
Step 1: Data layer — 4 new tables (platforms/nodes/command_logs/ssh_sessions),
data migration (category→Node), repos + API routes
Step 2: Auth layer — JWT middleware on all routes, TOTP JWT integration
Step 3: Web SSH — asyncssh connection pool, /ws/terminal endpoint,
xterm.js frontend, Koko protocol
Step 4: Sync engine v2 — file/command/config/SFTP modes, parallel execution
Step 5: Frontend migration — 12 Tailwind CSS v4 + Alpine.js pages,
PHP-FPM removal from nginx config
21 Python backend + 12 HTML frontend + 2 deploy configs + 3 test files
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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