feat: implement hybrid database architecture and frontend encryption

- Add PostgreSQL + SQLite hybrid database support with automatic switching
- Implement frontend AES-GCM + RSA-OAEP encryption for sensitive data
- Add comprehensive DatabaseInterface with all required methods
- Fix compilation issues with interface consistency
- Update all database method signatures to use DatabaseInterface
- Add missing UpdateTraderInitialBalance method to PostgreSQL implementation
- Integrate RSA public key distribution via /api/config endpoint
- Add frontend crypto service with proper error handling
- Support graceful degradation between encrypted and plaintext transmission
- Add directory creation for RSA keys and PEM parsing fixes
- Test both SQLite and PostgreSQL modes successfully

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: tinkle-community <tinklefund@gmail.com>

view_pg_data.sh

@@ -59,15 +59,7 @@ GROUP BY used
 ORDER BY used;
 "
 
-echo -e "\n📝 未使用的内测码:"
-$DOCKER_COMPOSE_CMD exec postgres psql -U nofx -d nofx --pset pager=off -c "
-SELECT code 
-FROM beta_codes 
-WHERE used = false 
-ORDER BY created_at DESC;
-"
-
 echo -e "\n👥 用户信息:"
 $DOCKER_COMPOSE_CMD exec postgres psql -U nofx -d nofx --pset pager=off -c "
 SELECT id, email, otp_verified, created_at FROM users ORDER BY created_at;
-"
+"