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>

mobile/keystore.properties

@@ -0,0 +1,4 @@
+storeFile=../../task-team-release.keystore
+storePassword=TaskTeam2026Release!
+keyAlias=task-team
+keyPassword=TaskTeam2026Release!