Major codebase cleanup: DRY schemas, remove dead config, consolidate modules
- Created Towerops.Schema base macro (95+ schemas updated to use it)
- Created Towerops.Snmp.Reading macro (7 reading schemas consolidated)
- Created Towerops.Gaiia.BaseSchema macro (4 Gaiia schemas consolidated)
- Created Towerops.SyncLog shared module (UISP + Preseem merge)
- Created Towerops.LogFilters (3 log filter modules merged into 1)
- Created Towerops.OnCall.ChangesetHelpers (9 on-call schemas simplified)
- Created API v1 ResourceController shared helpers (7 controllers)
- Extracted ConnectionHelpers.format_connection_result (2 LiveViews)
- Removed 5 dead config keys (scopes, mib_dirs, stripe_meter_id, etc.)
- Fixed 2 pre-existing broken tests
- All 13,219 tests pass, Credo clean (0 issues)
Graham McIntire
a4e08b2aca