Replace the rulerCallback with rulerProviderFactories following the
standard ProviderFactory pattern (like auditorProviderFactories). The
ruler is now created via factory.NewProviderFromNamedMap and registered
in factory.Registry for lifecycle management. Start/Stop are no longer
called manually in server.go.
- Ruler interface embeds factory.Service (Start/Stop return error)
- signozruler.NewFactory accepts all deps including EE task funcs
- provider uses named field (not embedding) with explicit delegation
- cmd/community passes nil task funcs, cmd/enterprise passes EE funcs
- Remove NewRulerProviderFactories (replaced by callback from cmd/)
- Remove manual Start/Stop from both OSS and EE server.go
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