Swagger docs + Error tracking + Email + Production keystore

- Swagger UI at /docs (70+ routes documented)
- Error tracking: error_logs table, /errors/report, /errors/recent, /errors/stats
- Global error handler logs to DB
- Email: nodemailer, /email/send, /email/reminder (SMTP placeholder)
- Production keystore: RSA 2048, valid 2053, info.hasdo.taskteam

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/package.json

@@ -25,6 +25,7 @@
     "dotenv": "^17.3.1",
     "fastify": "^5.8.4",
     "ioredis": "^5.10.1",
+    "nodemailer": "^8.0.4",
     "passport": "^0.7.0",
     "passport-facebook": "^3.0.0",
     "passport-google-oauth20": "^2.0.0",