enbility / eebus-go / 30638645418

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fix: ignore useCaseAvailable flag on client (EG) side (#253)

Fixes #252 (TC_SPINE_RTC_003).

## Problem

Per SPINE-TS-UCD-01, a client acting as Energy Guard must **completely
ignore** the `useCaseAvailable` flag received during Use Case discovery.
The shared `UseCaseBase` event handler (`usecases/usecase/events.go`)
instead gated on it and `continue`d past the use case support entry
whenever the remote server sent `useCaseAvailable=false` — so the client
aborted setup and never initiated node management operations. Affects
all use cases routed through `useCaseDataUpdate()` (LPC, LPP, ...) in
the EG role.

## Fix

- Remove the `useCaseAvailable` check from the guard condition.
- Simplify the redundant `ScenarioSupport == nil && len(...) == 0` to
`ScenarioSupport == nil` (`len(nil) == 0` always).
- Replace the stale comment referencing the old behavior.

## Test

Updated `events_test.go`: the EV support entry with
`useCaseAvailable=false` now asserts the use case registers instead of
being dropped. All `usecases/...` suites pass, including `eg/lpc` and
`eg/lpp`.

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