- Add tab selector in Monitoring Configuration section for choosing monitoring mode
- SNMP & ICMP mode: enables ICMP pings + SNMP discovery (default)
- ICMP Only mode: enables only ICMP ping monitoring, hides SNMP fields
- Monitoring mode controls snmp_enabled field automatically on save
- Test SNMP Connection button shows informational message when agent is configured
(agents handle SNMP testing during their polling cycle)
- Update all tests to use tab selector instead of setting snmp_enabled directly
- All 818 tests passing with no Credo warnings
